8-185 Section 820. Traffic Signals
820.01 Description
This work consists of providing required components to complete the following: Provid ing complete, operating traffic and pedestrian signals and installing temporary traffic signal heads, span wires, strain poles, pedestals, illuminated case signs, traffic loops, and vehicular and pedestrian detection and cabinets . Furnish, fabricate, and erec t a traffic signal mast arm pole and mast arm including anchor base type steel mast arm pole, including mast arms and other associated hardware required to complete the work . This work consists of providing all labor, equipment, and materials to install a mast arm pole foundation, including anchor bolts and other associated hardware required to complete the work. This work includes:
A.Remove, salvage, or dispose of traffic and pedestrian signals , temporary traffic signals , span wires , mounting assemblies, str ain poles, pedestals, illuminated or non-illuminated case signs, traffic loops, and digital loop detectors, controller, and cabinets . The removal includes removing all temporary traffic signal heads and associated material to ensure a complete removal. Cover (bag) or remov e cover from (unbag) a traffic or pedestrian signal face assembly or a case sign face as required to maintain traffic requirements associated with the p roject . This work includes all material required to securely fasten the bag to the signal or case sign faces or to unbag the signal or case sign faces.
B.Relocate or re- install, on the project, existing traffic control equipment, traffic and pedestrian signals, mounting assemblies, strain poles, pedestals, illuminated or non -illuminated case s igns, and removed digital loop detectors, controller, and cabinets
C.Furnish all labor, equipment , and materials required to remove an anchor, strut, or pole guy including guy wire, anchor rod, anchor, strut, insulators, hardware, grounding, and any other material required to complete the work . Disposal of this material is included.
D.Excavate, backfill , restore the site in kind in accordance with section 816, and dispose of excess or unsuitable material .
E.Take ownership of and properly dispose of removed material not identified for salvage. MDOT Standard Specifications for Construction Section 820 8-186 F. Store salvaged equipment in a protected and clean environment before installation on the project.
G.Provide all labor, equipment, and material required to install strain pole foundations and anchor bolts in accord ance with subsections 105.10,
820.03 C , and 908.14.C.
H.Provide all labor, equipment, and materials to install a steel casing when constructin g a steel strain pole or mast arm pole foundation. Use casings that conform with subsections 105.10 and 919.10.
I.Furnish, fabricate, and provide all labor, equipment, and materials necessary to erect an anchor base type (six -bolt system) traffic signal steel strain poles and mast arm s per standard detail.
J.Remove mast arm(s), mast arm fittings and mounting brackets, ground rod(s), ground wire, service cable, PVC conduits or galvanized rigid metal pipe risers, and other material required for a complete removal of the mast arm. This work includes disposing of removed materials, as directed by the Engineer.
K.Remov e a mast arm standard (pole) including hardware, fittings, wiring, grounding, ground rod(s), conduit(s), and other material required for a complete removal of the mast arm standard (pole) . This work also includes disposing of removed materials, as directed by the Engineer. Provide qualified individuals to supervise and complete this work. The Department uses the abbreviations in Table 820-1 for traffic signals on the plans and in these specifications. Table 820- 1: Traffic Signal Abbreviations Abbreviation Definition TS .................... Traffic signal, pedestrian signal, and flasher signal designated by a number LTGA ................ Left-turn green arrow RTGA ............... Right -turn green arrow STGA ............... Straight -through green arrow CS .................... Case sign LED .................. Light -emitting diode
820.02 Materials
Provide materials in accordance with the following sections : Concrete Mix and Slurry ....................................................................... 718 MDOT Standard Specifications for Construction Section 820 8-187 Conduit Material .................................................................................... 819 Drilled Shafts ......................................................................................... 905 Anchor Bolts .......................................................................................... 908 Handholes ............................................................................................. 918 Casings ....................................................................................105 and 919 Span Wire ............................................................................................. 921 Traffic Loop ........................................................................................... 921 Vehicular Traffic Signals and Mounting Assemblies .............................. 921 Pedestrian Signals ................................................................................ 921 Traffic Signal Strain Pole ....................................................................... 921 Traffic Signal Pedestal .......................................................................... 921 Illuminated Case Signs ......................................................................... 921 Non-Illuminated Case Signs .................................................................. 921 Digital Loop Detector ............................................................................ 921 Steel Truss Arms ................................................................................... 921 Service Disconn ects ............................................................................. 921 Antennas ............................................................................................... 921 Concrete Grade 3500 ......................................................................... 1003 Secure the Engineer’s approval for components of vehicular traffic signals and mounting assemblies not shown on the plans or not specified in subsection 918.04. Used material (in like-new condition) for the installation of a temporary traffic signal head is acceptable, upon approval by the Engineer prior to installation. All other appurtenant material must be new or as directed by the Engineer. Provide material specifically designed and manufactured for the pur pose of bagging and unbagging traffic signal heads and case signs . Previously used bag material is acceptable as long it meets the requirements of these specifications and is approved by the Engineer . Ensure that bag material is dark and completely cover s (masks) the traffic or pedestrian signal face or case sign face. When installed, the bag must prevent visible light emission from the traffic or pedestrian signal face or case sign face and completely obscure the case sign legend.
820.03 Constr uction
A.Foundations for Strain Poles, Mast Arm Poles, Pedestals and Traffic Signal Controllers . Provide Grade 3500 concrete for the foundations of mast arm standards, steel strain poles, pedestals, or traffic signal control lers, in accordance with section 1003 . Ensure that all work is in accordance with sections 718, 818, 819, 820, subsection 810.03, and the applicable signal construction details . Remove or install foundations as shown on the plans unless soil or site condit ions require additional direction from the Engineer. MDOT Standard Specifications for Construction Section 820 8-188 1. Concrete Placement . Compact concrete during and immediately after depositing, using required tools . Ensure that the concrete completely fills the form or excavation and fully encases the reinforcement and embedded fixtures . Produce a dense, waterproof concrete, free of voids and honeycomb. Do not use salt or other chemicals to prevent the concrete from freezing. Before installing poles, c ure foundation concrete until concrete attains at least 70% of its required minimum 28-day flexural or compressive strength. Do not use construction rubble, broken sidewalk, or other deleterious material in place of concrete. Replace cracked or otherwise defective foundations, as determined by the Engineer, at no additional cost to the Department. Maintain temporary enclosures and other protection for concrete for at least 24 hours after removing the heating source.
2.Construction . Construct strain pole and mast arm foundations, cased or uncased, in accordance with subsections 810.03.J and 810.03.K. Locate the foundation as shown on the plans, unless otherwise directed by the Engineer. Obtain the Engineer’s approval before placing foundations . Place the lower portion of the foundation without forms unless the soil is subject to caving and the Engineer approves the use of forms . Use forms to shape the upper part of the foundation. Place concrete and finish the top surface of the foundation at the elevation shown on the plans or as directed by the Engineer. Place base mount controller foundations using forms to shape the foundation as shown on the plans and the signal details . Ensure that the top surface of the controller foundation is horizontal, finished with a smooth straight surface and free of irregu larities . Place the controller cabinet flush with the foundation. Ensure that gaps between the foundation and the controller cabinet do not exceed ⅛ inch or as directed by the Engineer. Place the concrete pad adjacent to the foundation in front of the controller cabinet door as shown on the plans or as directed by the Engineer. Place concrete in the forms in layers, compact, and finish the concrete to the thickness shown on the plans . Construct a continuous pad MDOT Standard Specifications for Construction Section 820 8-189 between expansion joints . After placing the co ncrete within forms, use a screed, guided by the forms, spread the concrete, and compact. Protect foundations to prevent injury to pedestrians, motorists, and project personnel until installation of the standards. Install ground rods and ground wires . Connect the ground wire to the ground rod with a copper -clad, steel, solderless type clamp . Ensure electrically solid and mechanically secure connections.
3.Backfill and Restoration . Place backfill in compacted layers no greater than 12 inches thick . Compact layers to at least 95 % of the maximum unit weight . Place backfill in accordance with section 206. Restore disturbed areas in kind in accordance with section 816. Dispose of non -hazardous, contam inated material from drilled shafts or other foundations as required.
a.The safety of the drilled shaft excavation, surrounding soil , and material supported by the soil and the stability of the sidewalls are the Contractor ’s responsibility . The hydrovac type method is allowed for the first 4 feet below grade with the remaining excavation method as determined by the Contractor and approved by the Engineer.
b.Do not leave drilled shaft excavations unfilled overnight unless the following conditions are met . Dry drilled shafts are drilled shafts where the flow rate of water into the excavation does not exceed 12 inches within 1 hour . Ensure that all open drilled shafts have appropriately sized and attached covers . Ensure that all open drilled shafts in soil are cased overnight. Dry Drilled Shafts . Temporary casing in dry drilled shafts is acceptable. However, the consequences and the associated costs are the responsibility of the Contractor . Consequences may include, but are not limited to, hole collapse after the temporary casing is withdrawn or the need to leave temporary casing in place when it was not indicated in the contract . No additional payment will be made when temporary casing used to keep the hole open overnight must be left in place. Wet Drilled Shafts . Ensure that wet drilled shafts have casing installed to the plan bottom of drilled shaft and the excavation within the casing is stopped a minimum distance of 5 feet above the plan bottom of drilled shaft during the nighttime shutdown period. Excavation to the plan bottom of drilled shaft elevation must be made the following day, prior to pouring the concrete. MDOT Standard Specifications for Construction Section 820 8-190 c. Water within drilled shafts in excess of 3 inches may be pumped provided the flow rate of water into the excavation is less than 12 inches per hour.
d.Using the tremie method is acceptable whether placing the concrete in a wet or dry drilled shaft excavation. Use a watertight tremie consisting of a tube of sufficient length, weight, and diameter (8-inch minimum inside diameter) to discharge concr ete at the shaft base elevation. Ensure that the inside and outside surfaces of the tremie are clean and smooth . Pumped concrete must be placed in accordance with subsection 718.03.H.3.
e.Completely assemble a cage of reinforcing steel that consists of longi tudinal and horizontal bars as indicated on the appropriate signal construction details . Provide a fully assembled steel reinforcement cage for inspection after inspection of the excavation and prior to placement of concrete. Support the cage to control vertical displacement during concrete placement . Ensure that steel reinforcement has a clear cover of 3 inches, unless otherwise noted; it may be adjusted to ensure proper clear cover.
f.Ensure that anchor bolts and conduits are rigidly installed before the concrete is placed. Space anchor bolts by means of a template. The center of the template must coincide with the center of the foundation.
g.Continuously cast concrete once placement has commenced until shaft concrete casting is completed. Exposed concrete sur faces must be cast in forms, and exposed concrete edges must be beveled ¾ inch.
B.Casing Used with Strain Poles and Mast Arm Poles. Install the steel casing as indicated on the plans or as directed by the Engineer . Install the steel casing in a manner that produces a positive seal at the bottom of the casing to prevent the entry of water and/or soil into the shaft excavation or install the steel casing to the bottom of the foundation, whichever is less in length. Leave the steel casing in place. The steel casing may stop at the conduit entrance into the foundations . The top of the foundation may be formed separately without steel casing. Ensure that a suitable method of compaction is employed to ensure that the soil immediately outside the casing is comp acted properly and complies with section 206.
C.Traffic Signal Strain Pole
1.Fabrication . Fabrication plants must be certified in accordance with subsection 707.01. B.4. Weld in accordance with subsection
707.03 D.10. a.
MDOT Standard Specifications for Construction Section 820 8-191 a. Ultrasonically test full-penetration butt welds of longitudinal seam welds in accordance with subsection 819.03.D . Except for material thickness equal to or greater than 5/16 inch, the accept/reject criteria will be according to AWS D1.1, Section 6.13 and Table 6.3.
b.Blast clean all components prior to galvanizing and galvanize in accordance with ASTM A123/A123M . Ensure that touch up required for any field drilled holes is in accordance with subsection
716.03 E.
2.Installation
a.Orient the pole on the foundati on so the handhole is located on the shaft, perpendicular to the resultant span direction for box spans, perpendicular to the span direction for diagonal spans, or as directed by the Engineer.
b.Ground and bond the pole as shown on the details.
c.Install the pole to orient the foundation and anchor bolts as shown on the plans or as directed by the Engineer. Face handholes away from traffic.
d.Tighten anchor bolts to a snug condition in accordance with subsection 810.03.N.
e.Repair coating damaged in tr ansporting, handling, or erection in accordance with subsection 716.03.E at no additional cost to the Department.
f.Remove poles as shown on the plans . Completely remove the foundation of embedded steel pole or strain pole foundations or as directed by the E ngineer.
D.Traffic Signal Mast Arm Pole and Mast Arm
1.Fabrication . Fabricate in accordance with s ection 707.
a.Attach the arm tube to a connection plate by a full -penetration weld. Bolt the arm tube to the pole tube as shown on the plans . Control distortion of flange plates for flatness to ensure full contact between mating surfaces in an unbolted, relaxed condition.
b.Weld the longitudinal seam at arm lap joint using a full -penetration butt weld with a minimum of 36 inches long. When erected and in final positio n, the lap of the arm tubes may not extend beyond the butt weld.
c.Ultrasonically test full-penetration butt welds of longitudinal seam welds in accordance with subsection 819.03.D . Except for material MDOT Standard Specifications for Construction Section 820 8-192 thickness equal to or greater than 5/16 inch, the accept/reject criteria will be according to AWS D1.1, Section 6.13 and Table 6.3.
d.Blast clean all components prior to galvanizing and galvanize in accordance with ASTM A123 /A123M . Ensure that touch up required for any field drilled holes is in accordance w ith subsection
716.03 E.
2.Installation
a.Tighten anchor bolts in accordance with subsection 810.03.N . Ensure that all installation procedures are witnessed by the Engineer.
b.When installing telescoping arm tubes, the lap of the arm tubes may not extend beyond the butt weld.
c.Repair coating damaged in transporting, handling, or erection in accordance with subsection 716.03.E at no additional cost to the Department.
E.Span Wire . Install span wire and messenger wire , guys, and required fittings as shown on the plans or as directed by the Engineer. If the Contractor asks to replace span wires that are shown on the p lans as being installed or replaced by the utility company, the Department will consider this request a change to facilitate ease of construction by the Contractor . Obtain prior approval from the utility company and perform work at no additional cost to the Department. Obtain the approval of the Engineer before changing span wires. Install new anchor guys on an angle as indicated on the plans, and include a porcelain strain insulator unless otherwise required. Strain insulators are not required for strut guys.
F.Guy, Remo ve. Remove an anchor, strut , or pole guy as indicated on the plans or as directed by the Engineer . Dispose of the removed material per section 204 and as directed by the Engineer . All work must comply with sections 818 and 820.
G.Vehicular Traffic Signals, Pedestrian Signals, and Mounting Assemblies. Obtain the Engineer’s approval before removing existing TS equipment . Remove, install, or relocate LED signals and mounting assemblies . Remove the signals in stages or when the Engineer determines that alternate signals are adequate. Provide LED signal modules that do not require special tools for installation. Ensure that the LED modules fit into existing traffic signal housings without modifying the signal housing. MDOT Standard Specifications for Construction Section 820 8-193 To install the LED module when retrofitting assemblies, remove the existing lamp, socket assembly, gasket, and reflector . Connect the LED module to the existing terminal block . The Engineer will not allow the use of screw -in type products. Assemble TS heads and wire with fittings and color -coded wire in accordance with the specifications and as shown on the plans. Install new TS cable to existing TS heads as required due to the relocation or removal and installation of the TS controller and cabinet as indicated on the plans.
H.Traffic Signal Head, Temporary . Complete the work in accordance with sections 818 and 820, as shown on the plans, and as directed by the Engineer . Receive prior approval from the Engineer for any plan changes that may cause the placement of a temporary traffic signal head to be altered from the plans . Ensure that modifications to the maintenance of traffic are approved by the Engineer . Remove and dispose of material in accordance with section 204 or as directed by the Engineer. Complete bagging and unbagging of a traffic or pedestrian signal face assembly or a case sign face as shown on the plans or as directed by the Engineer . Ensure that the bag is securely attached to the unit and maintained to meet stage construction requirements . Replace any bag that falls off the unit in accordance with subsection 812.03.C.1.b and at no additional cost to the Depar tment. Obtain prior approval from the Engineer for any plan changes that may cause the sequence of bagging and unbagging to be altered from the sequence shown on the plans . No additional compensation will be made for changes in the maintaining traffic staging that are made for the Contractor’s convenience. Dispose of all bag material when the project is complete in accordance with subsection 205.03.P. Hang the suspension TS in a vertical plane, face the heads as required, tighten lock nuts, and seal the top of the traffic signal with a construction -grade silicone sealant. If TS span adjustments by the local utility company are required to maintain the TS mounting height, coordinate with and provide at least a 48-hour notice to the local utility company befor e starting work . For bracket arm signals, drill a hole in each standard, at each required location, to allow the cable to pass through the bracket -arm cable-entrance inlet . If required, drill two holes in the standard to allow the signal cable to loop into the lower bracket and out the upper bracket . MDOT Standard Specifications for Construction Section 820 8-194 Install the bracket arm signals vertically on the standards, face signals as required, and tighten the lock nuts. Use only straight pipe threads for mounting assemblies fabricated from pipe. Grease TS fitti ngs and threads with a non- oxide type grease. Use dead-end galvanized steel stand grips on guy wires. Connect wires with Engineer -approved nylon insulated, solderless connectors, and tape. Construct overhead lines in accordance with the contract . Refer to subsection 818 .01 for items not identified in the contract. Take ownership of and properly dispose of removed material not identified for salvage. Store and dispose of removed material identified for salvage as directed by the Engineer. Field paint TS brac ket arms as required. The Department will set the timing and offset of the signals as required unless otherwise indicated on the plans . The Department will put them into operation. Install cables on poles or in ducts, as shown on the plans. Install signal cables in a continuous length from the controller to each signal, unless shown otherwise on the plans . Pull the cable through the ducts without damage or kinks . Train cables near the top of the wall, manhole, or handholes . Bend cable without damage. Bundle cables and secure to the wall of the manhole or handhole with galvanized A and J anchors or an Engineer -approved equal . Provide supports at no greater than 2- foot spacing. Extend the sheath of the traffic signal cables into the signal traffic heads and at least 1 inch into the controller cabinet . Strap traffic signal cables inside the controller cabinet . Identify cables within the cabinet with tags . Identify each traffic signal cable with a stamped brass tag in handholes . Maintain present traffic signal service with minimal interruptions during traffic signal equipment relocation. Notify the Department 7 working days before relocating controllers or shutting down other traffic signals. Provide pedestrian signal units with housing, visors, optical units, mounting brackets, lamps, and wiring. MDOT Standard Specifications for Construction Section 820 8-195 Notify the Engineer and the local utility responsible for maintaining, operating, and providing power to the traffic signal when adding or removing a traffic signal load from service. Use only salvaged traffic signals previously installed as new traffic signals unless directed otherwise by the Engineer. Bag and unbag temporary or final traffic and pedestrian signal displays and case signs as shown on the plans, unless directed otherwise by the Engineer.
I.Traffic Signal Pedestal . Provide traffic signal pedestal equipment for mounting traffic and pedestrian signals and pedestrian pushbuttons, as shown on the plans. Ground and bond the pole as shown on the details . Install the pole to orient the foundation and anchor bolts as shown on the plans or as directed by the Engineer . Face handholes away from traffic. Tighten top anchor bolt nuts to a snug condition in accordance with subsect ion 810.03.N.2.a . Remove steel or concrete poles as shown on the plans . Completely remove the foundation of the embedded pole, strain pole, or pedestal pole/pushbutton pole, or as directed by the Engineer.
J.Mast Arm, Remove . Remove the mast arm, fittings, and associated materials as required for a complete removal . Dispose of the removed material as directed by the Engineer . Complete this work in accordance with sections 204, 818, and 820.
K.Mast Arm Standard, Remove. Remove the mast arm standard (pole), fittings, wiring, conduit(s), grounding, ground rod(s), and other material as required for a complete removal . Dispose of the removed material as directed by the Engineer . Complete this work in accordance with sections 204, 818, and 820.
L.Illuminate d Case Signs. Wire and ground internally illuminated LED and changeable message case signs with color -coded wire in accordance with the owner ’s specifications and as shown on the plans. Case signs must have an internal disconnecting means. Assemble case si gns with fittings wired. Make wire connections with Engineer -approved solderless connectors .
M.Non-Illuminated Case Signs. Install, remove, or salvage non- illuminated case signs, including connecting hardware as shown on the plans. MDOT Standard Specifications for Construction Section 820 8-196 N. Electrical Wire and Cable. Provide, install, and remove traffic signal wires and cable in accordance with section 818 . Place marking tape from 6 to 18 inches above installed underground conduit or cable, except for jack and bored conduit or directional bore conduit . The Department will provide marking tape with the MDOT logo and telephone number.
O.Conduit . Provide, install, relocate, and remove direct buried and encased conduit and associated fittings in accordance with section 818 . The Contractor may submit an alternate method for c onduit installation to the Engineer . Obtain the Engineer’s approval for the alternate method before proceeding. Complete alternate conduit installation at no additional cost to the Department. Join conduit pipe fittings and bends with an Engineer -approved PVC conduit cement. To repair conduit under pavement, sidewalks, or earth, locate the conduit break, replace, and sleeve a new conduit section. Repair the concrete encasement and restore the site. Use smooth wall, Schedule 80, rigid PVC conduit, or coilable, Schedule 80 PE conduit in accordance with section 819. Locate conduit breaks using exploratory trenching techniques . Excavate a trench at least 1 foot on each side of the damaged conduit section to perform the rehabilitation. Remove the section of broken conduit and replace with new conduit . Ensure that the new conduit overlaps the existing conduit by at least 3 inches on each end. Connect the new and existing conduit using the manufacturer -recom mended coupling and adhesive to form a waterproof seal. If existing conduit is encased, encase the new conduit in Grade 3500 concrete as specified in section 1004 .
P.Wood Pole . Provide, install, relocate, and remove wood poles in accordance with section 818 .
Q.Traffic Loop . The Engineer may change the location of traffic loops. Center loops in traffic lanes unless otherwise shown on the plans or as directed by the Engineer . Place loops so they do not enclose joints, cracks, manholes, handholes, and other castings and ferrous material . Obtain the Signal Shop approval of loop location changes. Cut slots in the pavement in accordance with subsection 603.03. Use high-pressure water and air to clean and dry slots before placing traffic loop wire. Remove dirt, dust, oil, and grease from the slot that could prevent bonding of the sealant . Remove dirt, dust, debris, and standing MDOT Standard Specifications for Construction Section 820 8-197 water from the adjacent pavement to avoid contaminating the slot during loop installation. Lay wire in the slot and r educe the sharpness of bends . Leave the wires loose in the slot. Ensure that wire in the loop and lead-in is free of kinks, abrasions, and punctures . Use required tools to prevent damage to the loop wire. Do not use screwdrivers or sharp instruments. Use four turns of wire in loops no greater than 6 by 10 feet. Use three turns of wire for loops greater than 6 by 10 feet. Twist loop lead- ins with at least two turns per foot to prevent mechanical movement between individual wires. Bring loop lead-ins into handholes at the time of loop installation and protect against damage. Tape the ends to prevent water from entering the wire. If sealing detector loops, ensure that the roadway surface and wire reservoir are dry. The roadway temperature must be at least 40°F and rising for at least 4 hours after sealant application. Place sealant in accordance with the manufacturer’s instructions . Do not mix sealant with solvents, thinners, or other solids . Apply sealant when the ambient temperature is from 40 to 100°F . Allow the sealant to cure before placing a layer of paving over the loops. Place the loop wires at least ½ inch below the surface of the slots in the pavement and fill the slots with sealant . If required, use soft restraints to hold the wires ½ inch below the surface. Place the sealant flush with the road surface. Before the sealant sets, strike-off surplus sealant . Do not use solvents to clean sealant off pavement . The Engineer will determine when to open the sealed areas to traffic. Provide at least a 1 megohm resistance to ground to the loop and lead-in . In the absence of circuit grounds, provide a temporary ground for testing by driving a ground rod. Test each loop for continuity at the handhole and ensure that the resistance does not exceed 1.5 ohms.
R.Digital Loop Detector . Install a rack -mounted, digital loop detector in the controller and cabinet with the number of channels shown on the plans or as directed by the Engineer.
S.Site Restoration and Waste Disposal . Dispose of waste as directed by the Engineer and in accordance with subsection 205.03. Restore the site in accordance with 816. MDOT Standard Specifications for Construction Section 820 8-198 T. Handholes . Install precast concrete handholes of the design and dimensions shown on the plans.
U.Traffic Signal Controller and Cabinets . Secure the traffic signal controller cabinet as shown on the plans for pole- or base-mounted cabinets. Provide the Department with two copies of the manufacturer’s specifications for the controller and outline the special details, features, or changes in design operation. Provide the Department with one complete wiring diagram, parts list, assembly drawings, and maintenance manual for the controller. Provide traffic signal controllers capable of accepting the required timing. Ground traffic signal installations with solid state controllers at each span contact pole. Ensure that the ground has a measured resistance no greater than 10 ohms.
V.Warning Sign . Install or remove warning signs equipped with traffic signal sign opticals, including sign supports, as shown on the plans . Provide a sign legend and sign optical lens size as shown on the plans and in accordance with the MMUTCD, Special Sign Details, and signal construction details. Install or remove sign optical lenses on existing signs as shown on the plans or as directed by the Engineer.
W.Traffic Signal Antenna . Complete this work in accordance with sections 818 and 820, as shown on the plans, and as directed by the Engineer . Remove, store, and dispose of material in accordance with s ection 204.
1.Installation . When installing new equipment is specified, furnish and install the traffic signal antenna as shown on the plans. Installation includes the mounting brackets, surge protection, hardware, connectors, fittings, wiring, line hardwar e, cable to controller, and grounding required to ensure a complete installation, as specified for a location. Install the antennas after the rest of the signal equipment (signal heads, poles, case signs, span wire, etc.) has been installed. Obtain the Engineer’s approval prior to beginning antenna installation. Correct antenna installation that was completed prior to the approval of the Engineer and found to be non- optimal placement of the antennas at no additional cost to the Department. The Engineer w ill not authorize extra payment or time extensions for work required to reorient or move the antenna. MDOT Standard Specifications for Construction Section 820 8-199 2. Removal . When removal is specified, remove the traffic signal antenna as shown on the plans. Removal includes the mounting brackets, surge protection, har dware, connectors, fittings, wiring, line hardware, cable to controller, and grounding required to ensure a complete removal, as specified for a location. Dispose of removed materials.
3.Salvage. When salvage is specified, remove existing traffic signal antenna, including the mounting brackets, surge protection, hardware, connectors, fittings, wiring, line hardware, cable to controller, and grounding required to ensure a complete removal, store salvaged materials in a protected and clean environment, and re-i nstall the materials.
X.Removing Emergency Pre-emption . Remove emergency pre-emption or install salvaged emergency pre-emption, removed from the project, as shown on the plans or as directed by the Engineer.
Y.Steel Truss Arms. Remove or install steel truss ar ms and related equipment as shown on the plans or as directed by the Engineer . Install truss arms following the installation of other traffic signal equipment, including span wire, signal heads, and strain poles, to accommodate truss arm adjustments, as di rected by the Engineer . Install truss arms in accordance with NEC and NESC. Where adjustment of steel truss arms is required, take responsibility for the premature installation of the truss arms at no additional cost or time to the Department.
820.04 Measurement and Payment
Pay Item Pay Unit TS, (number) Way (type) Mtd ................................................................... Each TS, (number) Way (type) Mtd, Salv .......................................................... Each TS, (number) Way (type) Mtd, (arrow type) .............................................. Each TS, (number) Way (type) Mtd, (arrow type), Salv ..................................... Each TS, 4th Level (arrow type) ........................................................................ Each TS, 4th Level (arrow type), Salv ................................................................ Each TS, (number) Way (type) Mtd (LED) ......................................................... Each TS, (number) Way (type) Mtd, (type) (LED) .............................................. Each TS, (number) Way (type) Mtd (LED) Retrofit Assembly ............................ Each TS, (number) Way (type) Mtd, (type ) (LED) Retrofit Assembly ................. Each TS, 4th Level, __ (LED) ............................................................................ Each TS, 4th Level, __ (LED) Retrofit Assembly ............................................... Each TS, 4th Level Arrow, Rem ......................................................................... Each Louver ....................................................................................................... Each MDOT Standard Specifications for Construction Section 820 8-200 TS Head, Adj ............................................................................................ Each TS, Head, Temp ........................................................................................ Each TS Face, Bag ............................................................................................ Each TS Face, Bag, Rem .................................................................................. Each TS, (t ype) Mtd, Rem ................................................................................. Each TS, Pedestrian, (number) Way (type) Mtd ................................................ Each TS, Pedestrian, (number) Way (type), Salv .............................................. Each TS, Pedestrian, (number) Way (type) Mtd (LED) ...................................... Each TS, Pedestrian, (number) Way (type) Mtd (LED) Countdown ................... Each TS, Pedestrian, (type) Mtd, Rem .............................................................. Each TS, Lens, Pedestrian Sym ........................................................................ Each TS, Lens ................................................................................................... Each TS, Lens, Rem .......................................................................................... Each TS, Lens, Salv .......................................................................................... Each TS, Antenna .............................................................................................. Each TS, Antenna, Rem .................................................................................... Each TS, Antenna, Salv ..................................................................................... Each Pushbutton ............................................................................................... Each Pushbutton and Sign ................................................................................ Each Pushbutton, Rem ...................................................................................... Each Conc Pole, Rem ........................................................................................ Each Steel Pole, Rem (Embedded) ................................................................... Each Strain Pole, Steel, Anchor Base, __ foot ................................................... Each Strain Pole, Steel, Anchor Base, __ foot, Salv .......................................... Each Steel Pole, Rem ........................................................................................ Each Strain Pole, Steel, Anchor Fdn .................................................................. Each Strain Pole Fdn, Cased .............................................................................. Foot Strain Pole Fdn, Uncased .......................................................................... Foot Strain Pole Fdn, 6 Bolt ............................................................................... Foot Strain Pole, Steel, 6 bolt, __ foot .............................................................. Each Mast Arm Pole, Cat__ ............................................................................... Each Mast Arm, __Foot, Cat .............................................................................. Each Mast Arm Pole Fdn, 6 Bolt ......................................................................... Foot Mast Arm, Remove ................................................................................... Each Mast Arm Std, Rem ................................................................................... Each Fdn, Rem .................................................................................................. Each Pedestal, Fdn ........................................................................................... Each Pedestal Fdn, Rem ................................................................................... Each Pedestal, Alum .......................................................................................... Each Pedestal, Alum, Salv ................................................................................. Each Pedestal, Rem .......................................................................................... Each Pedestal, Pushbutton, Alum ...................................................................... Each Pedestal, Pushbutton, Rem ...................................................................... Each Pushbutton, Pedestal, Alum ...................................................................... Each MDOT Standard Specifications for Construction Section 820 8-201 Pushbutton, P edestal, Rem ...................................................................... Each Casing ....................................................................................................... Foot Case Sign, (number) Way, __ inch by __ inch .......................................... Each Case Sign, (number) Way, __ inch by __ inch, Salv ................................. Each Case Sign, Disappearing Legend, __ inch by __ inch .............................. Each Case Sign, Disappearing Legend, __ inch by __ inch, Salv ..................... Each Case Sign (LED), (number ) Way, __ inch by __ inch ................................ Each Case Sign (LED), (number) Way, __ inch by __ inch, Retrofit Assembly ...................................................................................... Each Case Sign (LED), Changeable Message, (number) Way, __ inch by __ inch ..................................................................................... Each Case Sign Panel ....................................................................................... Each Case Sign, Rem ........................................................................................ Each Case Sign, Salv ........................................................................................ Each Case Sign Panel, Rem ............................................................................. Each Case Sign Panel, Salv .............................................................................. Each Case Sign, (number) Way, __ inch by __ inch, Non-Illuminated ............... Each Case Sign, Non-Illuminated, Salv ............................................................. Each Case Sign, Non-Illuminated, Rem ............................................................. Each Keep Rt Sign, Rem ................................................................................... Each Span Wire ................................................................................................. Each Span Wire, Rem ....................................................................................... Each Guy, Rem .................................................................................................. Each Anchor Guy ............................................................................................... Each Strut Guy .................................................................................................. Each Pole Guy ................................................................................................... Each Traf Loop .................................................................................................. Each Traf Loop, (type) ....................................................................................... Each Digital Loop Detector ................................................................................ Each Loop Detector, Rem .................................................................................. Each Digital Loop Detector, Salv ....................................................................... Each Riser ......................................................................................................... Each Riser, Rem ................................................................................................ Each Power Co. (Est Cost to Contractor) ......................................................... Dollar Conduit Repr, Under Pavt .......................................................................... Foot Conduit Repr, Under Sidewalk or Earth ..................................................... Foot Controller and Cabinet, Rem .................................................................... Each Controller and Cabinet, Salv ..................................................................... Each Controller Fdn, Base Mt d .......................................................................... Each Controller Fdn, Rem ................................................................................. Each Cabinet, Rem ............................................................................................ Each Cabinet, Salv ............................................................................................ Each Warning Sign ............................................................................................ Each Warning Sign, Rem ................................................................................... Each MDOT Standard Specifications for Construction Section 820 8-202 Sign Optical (LED) .................................................................................... Each Bracket, Truss, with __ foot Arm ............................................................... Each Bracket, Truss, Rem ................................................................................. Each Emergency Pre -emption, Rem ................................................................. Each Emergency Pre -emption, Salv .................................................................. Each Sign Optical, Rem ..................................................................................... Each
A.General . Unless otherwise required, the Engineer will measure traffic signal pay items based on plan quantities in accordance with subsection
109.01 A.
Pay items specified in this subsection, except removal items, include all components required to provide complete and functioning traffic signals. In addition to specific work for individual pay items, the unit prices for work specified in this subsection include t he following:
1.Excavation and backfill , including backfilling for removed items;
2.Disposal of waste material;
3.Storage of salvaged material;
4.Placing marking tape; and
5.Changes in the method of conduit installation requested by the Contractor. Restoring the sit e in kind in accordance with section 816 will be paid for separately.
B.Traffic Signals. The unit prices for relevant pay items for installing, salvaging as required, and removing traffic signals include the cost of storing and disposing of materials and providing and installing traffic signal heads, lamps, brackets, hardware, cable, and other material required to complete the work. The unit prices for the relevant traffic signal pay items include the cost of installing new TS cable from the TS head to the TS controller and cabinet as shown on the plans; coordinat ing with local utility companies in TS span adjustments; and stemming signal heads to maintain a minimum of 17-foot under -clearance from bottom of signal bracket to road surface for each span wire mounted signal head. Red signal faces will be at the same elevation in a given direction. The Engineer will measure and the Department will pay separately for Louvers based on the number of louvers required f or a signal face. The unit price for TS, Rem includes the cost of removing and disposing of traffic signals and pedestrian signals. MDOT Standard Specifications for Construction Section 820 8-203 The unit price for TS, Pedestrian includes the cost of pedestrian traffic signal heads, including salvaged heads. The unit price for TS Lens, Pedestrian Sym includes the cost of providing and installing the new lenses. The unit price for TS Lens includes the cost of installing traffic signal lenses. The unit price for TS Lens, Rem includes the cost of removing traffic signal le nses. The unit price for TS Lens, Salv includes the cost of installing salvaged traffic signal lenses. The unit price for TS Head, Adj includes the adjustment of a permanent or temporary traffic signal head, wiring, fittings, line hardware, lashing rod, lashing and/or unlashing of traffic signal cable, and all other material required to ensure a complete and operating job. The unit price for TS Head, Temp includes furnishing, installing, and removing a temporary traffic signal head and all material required to ensure a complete and operating job, as indicated on the plans or as directed by the Engineer. TS Face, Bag and TS Face, Bag, Rem. The Engineer will measure, as a unit, each traffic or pedestrian signal face regardless of the number of signal indications, and each case sign face. The unit prices for Pushbutton and Pushbutton and Sign include the cost of providing and installing pushbutton and sign. The unit price for Pushbutton, Rem includes the cost of removing the pushbutton, sign, and cables. The Department will pay separately for Traffic Signal Retrofit Assembly, but the cost of removing the existing lamp, socket assembly, gasket , and reflector and installing the LED traffic signal module without modifying the existing signal housing is included in the unit prices for relevant traffic signal pay items.
C.Strain Poles . The unit price for Strain Pole, Steel, Anchor Base includes the cos t of installing steel standards, grounding, and bonding, including salvaged standards, on the foundation. The unit price for Strain Pole, Steel, Anchor Fdn includes the cost of form work for foundation excavation, constructing foundations , and installing c onduit bends, grounding, and grounding rods. MDOT Standard Specifications for Construction Section 820 8-204 The Engineer will measure Strain Pole Fdn, Cased and Strain Pole Fdn, Uncased vertically from the bottom of the foundation and shaft to the top of the shaft . The unit prices for Strain Pole Fdn, Cased and Strain Pole Fdn, Uncased include the cost of installing conduit, grounding, grounding rods, and steel casing for foundation excavation. The unit price for Steel Pole, Rem includes the cost of removing the steel pole, hardware, fittings, wiring, grounding, ground rods, and conduits. The Engineer will measure Steel Pole, Rem (Embedded) as shown on the plans in accordance with subsection 109.01.A . The unit price for Steel Pole, Rem (Embedded) includes the cost of removing the steel pole with foundation, hardware, conduit, and other material required to complete the work and backfilling the hole with granular material. Strain Pole Fdn, 6 Bolt includes disposal of removed material in the pay item. Disposal of removed material must comply with section 204 or as directed by the Engineer. Strain Pole, Steel, 6 bolt, __ foot includes disposal of removed material in the pay item . Disposal of removed material must comply with section 204 or as directed by the Engineer.
D.Mast Arm Pole . Mast Arm Pole, Cat __ and Mast Arm, __ foot, Cat __ includes disposal of removed material in the pay item . Ensure that disposal of removed material complies with section 204 or as directed by the Engineer. Mast Arm Pole Fdn, 6 Bolt includes disposal of removed material in the pay item . Disposal of removed material must comply with section 204 or as directed by the Engineer . Steel casing is not included in this pay item and will be paid for separately. Mast Arm, Remove . Remove the mast arm, fittings, and associated materials as required for a complete removal . Dispose of the removed material as directed by the Engineer . Complete this work in accordance with sections 818 , 820, and 204. Mast Arm, Remove The completed work, as described, will be measured and paid for at the contract unit price. Mast Arm Standard, Remove. Remove the mast arm standard (pole), fittings, wiring, conduit(s), grounding, ground rod(s), and other material as required for a complete removal . Dispose of the removed material, as directed by the Engineer . Complete this work in accordance with sections 818, 820, and 204. Mast Arm Std, Rem . The completed work, as described, will be measured and paid for at the contract unit price. Removal of the mast arm MDOT Standard Specifications for Construction Section 820 8-205 standard (pole) foundation will be paid for separately using appropriate pay items. The unit price for Fdn, Rem includes the cost of removing the foundation in its entirety and backfilling the hole with granular materials.
E.Pedestals. The unit price for Pedestal, Alum includes the cost of installing pedestals, including salvaged pedestals, fittings , ground rods, and ground wire. The unit price for Pedestal, Fdn includes the cost of excavating and constructing new concrete foundations and installing grounding and ground rods. The unit price for Pedestal, Rem includes the cost of removing pedestals and associated hardware. The unit price for Pedestal Salv includes the cost of installing salvage d pedestals, hardware, fittings, connectors, wiring, service cables, grounding, ground rods, and conduits. The unit price for Pedestal Fdn, Rem includes the cost of removing the pedestal foundation, hardware, conduit, and other material required to complet e the work . Backfilling the hole with granular material is included in the pay item. The unit price for Pushbutton, Pedestal, Alum includes the cost of installing the aluminum pushbutton pedestal assembly, hardware, and fittings. The unit price for Pushbut ton, Pedestal, Rem includes the cost of removing the pedestal pushbutton assembly, hardware, and fittings. The unit price for Pushbutton Pedestal, Alum includes the cost of installing the aluminum pushbutton pedestal assembly, installing hardware, fittings , grounding, and ground rod . The unit price for Pushbutton Pedestal, Rem includes the cost of removing the pedestal assembly and hardware.
F.Case Signs, Illuminated or Non -Illuminated, Changeable Message. The unit prices for installing, salvaging as required, and removing the relevant case sign pay items for internally illuminated or changeable message signs include the cost of the signs, LED panels , brackets, hardware, cable, and other material required to complete the work . The relevant case sign pay items for non- illuminated signs include the cost of the signs, retroreflective panels, and other materials required to complete the work. MDOT Standard Specifications for Construction Section 820 8-206 1. Case Sign Panel . The unit price for Case Sign, Panel includes the cost of installing the case sign panel or retroreflective case panels.
2.Case Sign Removal . The unit price for Case Sign, Rem includes the cost of removing illuminated, changeable message, and non-illuminated case signs.
3.Case Sign Panel Removal . The unit price for Case Sign Panel, Rem includes the cost of removing case sign panels.
G.Span Wire . The unit price for Span Wire includes the cost of installing new span wire, insulator s, guys, and anchors . The messenger wire is incidental to the traffic signal installation and includes the 1/4-inch messenger wire, insulators, guys, and anchors. The Department considers the cost of changing out span wires, as requested by the Contractor, an accommodation to the Contractor at no additional cost to the Department. The unit pri ce for Span Wire, Rem includes the cost of removing span wire, guys, and associated hardware, and disposing of these items off the project.
H.Anchor Guy, Strut Guy, and Pole Guy . The Engineer will measure the required sizes of Anchor Guy, Strut Guy , and Pole Guy as a unit . The unit prices for Anchor Guy, Strut Guy , and Pole Guy include the cost of installing the guy wire, anchor rod, anchor, strut, and hardware.
I.Traffic Loop . The unit prices for Traf Loop and Traf Loop (type) include the cost of the following:
1.Sawing the slots in the pavement;
2.Making expansion joints;
3.Installing wires in the saw slots and to the handholes;
4.Placing caulking in ends of conduit;
5.Placing sealant in sawcuts and placing the shielded cable in conduit from its connection to the loop wire in the handhole to the traffic signal controller or digital loop detector cabinet;
6.Connecting the cabinet to the loop detector ; and
7.A ¾-inch minimum flexible conduit (non-metallic and rated for underground use) from the pavement to the handhole.
J.Digital Loop Detector . The unit prices for Digital Loop Detector and Digital Loop Detector, Salv include the cost of installing the following:
1.Cable, wire, and detector c onnections in existing cabinets; MDOT Standard Specifications for Construction Section 820 8-207 2. Digital loop detectors, including salvaged loop detectors; and
3.Cables to loop terminals in handholes. The unit price for Loop Detector, Rem , if a stand-alone item, includes the cost of removing the loop detector.
K.Riser . The Engineer will measure the required type of Ri ser, the conduit going from the earth to the weather head as a unit . The unit price for Riser includes the cost of installing PVC Schedule 80 or galvanized rigid metal pipe riser, weather head, expansion joint, fittings, wire arrangements on poles, and ass ociated hardware. The unit price for Riser, Rem includes the cost of removing risers, weather heads, hardware, and fittings.
L.Conduit Repair under Pavement . The Engineer will measure Conduit Repr, Under Pavt based on plan quantities in accordance with subsection
109.01 A . The unit price for Conduit Repr, Under Pavt includes the cost
of the following:
1.Locating the conduit break;
2.Repairing and sleeving new conduit sections; and
3.Repairing the concrete encasement. The Engineer will measure and the Department will pay for pavement removal and replacement in accordance with the Standard Specifications and pay items for that work.
M.Conduit Repair under Sidewalk or Earth . The Engineer will measure Conduit Repr, Under Sid ewalk or Earth based on plan quantities in accordance with subsection 109.01.A . The unit price for Conduit Repr, Under Sidewalk or Earth includes the cost of the following:
1.Locating the conduit break; and
2.Repairing and sleeving new conduit sections . The Engineer will measure and the Department will pay for sidewalk removal and replacement in accordance with the Standard Specifications and pay items for that work.
N.Controllers and Cabinets . The unit prices for removing controllers and cabinets and installing salvaged controllers and cabinets include the cost of removing brackets, hardware, fittings, connectors, cables within the cabinet , grounding, conduits attached to the cabinet , and other material. MDOT Standard Specifications for Construction Section 820 8-208 The unit prices for Controller and Cabinet, Rem and Cabinet , Rem include the cost of removing the digital loop detector as required, wiring, ground rods, and disposing of removed material. The unit prices for Controller and Cabinet, Salv and Cabinet, Salv include the cost of installing ground rods and reconnecting wiring. The unit price for Controller Fdn, Base Mt d includes the cost of placing and compacting backfill and installing conduit bends and ground rods. The unit price for Controller Fdn, Rem includes the cost of removing traffic signal controller foundations, controller pads, wiring, and ground rods.
O.Warning Signs . The unit prices for installing and removing the relevant Warning Sign or Sign Optical (LED) pay items include the cost of disposing of materials and providing and installing warning signs, supports, opticals, hardware, cable conduit , and other material required to complete the work. The unit price for Warning Sign, Rem includes the cost of remov ing warning signs, sign supports, and sign opticals with assembly. The unit price for Sign Optical (LED) includes the cost of installing LED traffic signals and sign opticals with assembly. The unit price for Sign Optical, Rem includes the cost of removing sign opticals with assembly.
P.Bracket Truss . The unit price for Bracket, Truss, with __ foot Arm includes the cost of installing brackets, hardware, fittings, connectors, ground rods, ground wire, and grounding. The unit price for Bracket, Truss, Rem includes the cost of removing brackets, hardware, fittings, connectors, ground rods, ground wire, and grounding.
Q.TS Antenna . The unit prices for installing, salvaging as required, and removing the relevant TS, Antenna pay items include the cost of the antenna (salvaged as required), surge protection, mounting brackets, hardware, connectors, fittings, wiring, line hardware, cable to controller , grounding, and other material required to ensure a complete removal or installation, as specified for a location. The unit price for TS, Antenna includes the cost of furnishing and installing a new traffic signal antenna at a location shown on the plans. The unit price for TS, Antenna, Rem includes the cost of removing antenna, wiring, cable from controller, grounding, and ground rods at a location shown on the plans . MDOT Standard Specifications for Construction Section 820 8-209 The unit price for TS, Antenna, Salv includes the cost of removing a traffic signal antenna, storing the removed materials on site, and reinstalling materials at a location shown on the plans .
R.Emergency Pre-emption . The unit prices for removing and installing the salvaged emergency pre-emption pay items include the cost of the t raffic signal pre- emption equipment associated with intersection traffic signal control devices, pre-emption units , and confirmation lights facing one or more directions, brackets, hardware, cable, conduit on pole, and other material required to complete t he work. The unit price for Emergency Pre -emption, Rem includes the cost of removing the traffic signal pre- emption equipment for emergency vehicles associated with intersection traffic signal control devices, pre-emption units facing one or more directions, and confirmation lights facing one or more directions. The unit price for Emergency Pre -emption, Salv includes the cost of installing the salvaged traffic signal pre- emption equipment associated with intersection traffic signal control devices, pre-emption units facing one or more directions, and confirmat ion lights facing one or more directions
S.Concrete Pole Removal . The unit price for Conc Pole, Rem includes the cost of removing concrete poles, hardware, fittings, connectors, wiring, grounding, ground rods, and conduits.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 746–770 of 1,146.