Part 1 — General
1.1 Section Includes
A.Traffic signals and supports .
1.2 Related Sections
A.Section 00555: Prosecution and Progress
B.Section 01554: Traffic Control
C.Section 02056: Embankment, Borrow, and Backfill
D.Section 02466: Drilled Shafts
E.Section 02890: Retroreflective Sheeting
F.Section 02891: Traffic Signs
G.Section 03055: Portland Cement Concrete
H.Section 03211: Reinforcing Steel and Welded Wire
I.Section 03575: Flowable Fill
J.Section 13594: Fiber Optic Communication
K.Section 16530: Electrical Power
1.3 References
A.AASHTO Roadside Design Guide
B.ASTM C 1107: Standard Specification for Packaged Dry, Hydraulic - Cement Grout (Nonshrink)
C.ASTM D 3005: Low-Temperature Resistant Vinyl Chloride Plastic Pressure -Sensitive Electrical Insulating Tape
D.ASTM D 3035: Polyethylene (PE) Plastic Pipe (DR -PR) Based on Controlled Outside Diameter
E.American Iron and Steel Institute (AISI)
F.American National Standards Institute (ANSI)
G.International Municipal Signal Association (IMSA) Standards
H.National Electrical Code (NEC)
I.National Electrical Manufacturers Association (NEMA)
J.Underwriters Laboratory (UL)
K.Utah Manual on Uniform Traffic Control Devices (U tah MUTCD)
1.4 Definitions
A.Powder Coat – Coating of metals applied to provide coloration.
1.5 Submittals
A.Qualifications for review :
1.Electrical work supervisor
a.Documentation of j ourneyman or master electrician licens ure
b.Documentation of at least three years of experience in traffic signal construction
2.Traffic signal work supervisor
a.Documentation of certifications
B.Contact information of Contractor representative for emergency traffic signal maintenance during construction for information
1.Include name and telephone number
C.Manufacturer’s documentation for Contractor furnished equipment and materials for information. Include at least the following:
1.List of equipment and materials inc luding manufacturer name , size, and identification number.
2.Manufacturers’ product data sheets and installation instructions, wiring diagrams, certifications, warranties, guarantees, and part lists.
D.Warranty letter for Contractor furnished electrical and mechanical equipment for information.
1.Include the following in the letter:
a.A statement that the Contractor guarantees the equipment free from defects for a period of six months. 1) The guarantee period starts on the date of physical completion. 2) The guarantee covers 100 percent of the Contractor furnished electrical and mechanical equipment.
b.Project Information: 1) State Project Designation 2) State Project Name 3) Contractor, Equipment Provider, and Installer Name
2.The Department will notify the Cont ractor during the guarantee period of equipment defects and will indicate whether equipment defects need to be repaired or if defective equipment needs to be removed and replaced.
a.For equipment defects indicated to be repaired, s ubmit detailed plans and procedures of repair work according to equipment provider ’s recommendations for review .
b.Repair, or remove and replace equipment as indicated within 30 days of notification .
1.6 Quality Control
A.Qualifications
1.Electrical work supervisor
a.Electrical work must be supervised in person by and under the responsibility of a journeyman or master electrician licensed in the State of Utah, and who has at least three years of experience in traffic signal construction.
2.Traffic signal work supervisors
a.Traffic signal work must be supervised in person or completed by certified personnel . 1) Provide at least one certified person on- site for crews of four or less . 2) Provide at least two certified persons on- site for crews of five or more.
b.Certified personnel must have at least one of the following certifications: 1) IMSA Traffic Signal Field Technician Level II 2) IMSA Traffic Signal Tech Level II Construction 3) Department approved equivalent
Part 2 — Products
2.1 Materials
A.Use electrical components as listed and defined by the NEC.
B.Refer to SL Series Standard Drawings.
2.2 State Furnished Materials
A.State Furnished Materials include :
1.Anchor bolts
2.Traffic signal poles
3.Mast arms
4.Luminaire poles and extensi ons
5.Radar detection equipment
6.Traffic signal head assembly
7.LED signal modules
8.Back plate and retroreflective tape
9.Visors
10.Signal head mounting brackets
11.LED luminaires
12.Mast arm lighting mounting bracket s
13.Cabinets (excludes pole- mounted cabinets for pedestrian flashing beacon options A & C )
14.Controllers
15.Related hardware
16.Pedestrian flashing beacon Option B (RRFB)
a.Manufacturer -specific p ole-mounted cabinet
b.Controller (AC or solar) 1) Battery for solar controller is not state furnished
c.Solar panel assembly
d.Wiring to connect solar panel assembly to solar controller
e.LED beacons
f.Associated mounting brackets and hardware
2.3 Wiring
A.Power Service/Lighting Conductors
1.Refer to Section 16530
2.Stranded copper conductors only
3.Conductors sized per NEC (minimum 10 AWG RHH RHW -2, XLP USE-2 or approved equivalent)
a.Power Service Conductors 1) Continuous red insulation color for AC load 2) Continuous white insulation color for neutral
b.Lighting conductors (240 Volt unless specified otherwise) 1) Continuous blue insulation color for AC loads 2) Continuous white insulation color for neutral (120/208 Volt only)
B.Signal Cable and Push Button Cable
1.Signal Cable: 4- and 7- conductor cables
2.Push Button Cable: 4- conductor cables
3.14 AWG multi- colored stranded copper conductors only
4.Meets IMSA 20- 1 specification
C.Bonding/Grounding Cable
1.Size bonding wire according to NEC article 250 (minimum 6 AWG, copper, s olid, bare, soft -drawn)
D.Radar Detection C able
1.Use manufacturer recommended multi -wire cable for the length of the installation.
2.Auxiliary Ground Wire: 12 AWG stranded, green insulated, UV rated.
3.Auxiliary Power Cable: 2 -Conductor 14 AWG shielded Loop Home Run Cable conforming to IMSA 50- 2 specification .
a.Do not use power wires (RED and BLACK) from the manufacturer recommended multi -wire cable.
E.Advanced Warning Signal (AWS) System Cable
1.4-conductor cables
2.14 AWG multi -colored stranded copper conductors only
3.Meets IMSA 20- 1 specification
2.4 Temporary Signal Head Cover
A.Heavy duty nylon or canvas, design ed to completely cover all faces, visors, and back plates.
1.Prevent indications and tape from shining through at night.
2.5 Pedestrian Signal Head
A.Refer to SL Series Standard Drawings.
B.Provide countdown pedestrian signal assembly with a gloss black colored polycarbonate housing and clear flat LED signal module .
C.Provide LED pedestrian countdown module which does not require special tools for installation and fit s into a 16 inch x 18 inch traffic signal housing.
1.Supply module rated for use in the ambient operation temperature range of -40 degrees F to +165 degrees F and completely sealed against dust and moisture intrusion.
2.Provide message display consist ing of a double overlay message combining the graphic symbols of a hand and walking man and two seven -segment digits.
a.Hand and man symbols no less than 10 inch high.
b.Countdown digits no less than 9 inch high.
D.Provide t erminal block consist ing of dual wiring, screw terminal and quick disconnect features for the N eutral , Walk and D on’t Walk phases.
E.Use ¾ inch wide by 0 .03 inch thick AISI type 201 stainless steel pole mount bands.
1.Provide c lamshell consisting of a two -part mounting assembly with stainless steel hinge pins on the pole- mounted half.
a.Secure t he two halves together with a stainless steel flat head socket bolt requiring a 3/16 inch Allen wrench.
2.Provide assembly that is interchangeabl e left to right mount.
2.6 Pedestrian Push Button Assembly
A.Refer to SL Series Standard Drawings.
B.Pedestrian Push Button with LED Indicator
1.Pedestrian button with standard 4 bolt circle.
2.ADA compliant assembly with a 2 inch diameter stainless steel actuator .
3.Assembly with solid state electronic Piezo switch with no moving plunger or moving electrical contacts.
4.Enclose supporting circuitry within the button with wiring to the push button terminated on two ¼ inch - 20 brass screw terminals .
5.Rain tight gasket to seal between the button assembly and the frame.
6.Button that gives indications to the user that a call has been made in both of the following forms:
a.Audible beep when button is pushed.
b.Momentary LED light as the button is pushed, or LED light that stays on for 3 to 5 seconds if the button is pushed and held closed, or an LED light that stays on until the pedestrian signal phase is activated.
7.Minimum 5 -year unlimited warranty.
C.Pedestrian Push Button Frame
1.Provide cast aluminum frame, powder coated black, capable of supporting push button and a 9 inch x 12 inch sign, with the following characteristics:
a.Frame attaches to the pole using two ANSI ¼ -20 x 1½ inch hex head or Phillips brass bolts attached behind the sign.
b.Frame is additionally supported using adjustable staves.
c.Sign attaches above the button using ANSI 8- 32 stainless steel Allen head screws .
d.Cable guide extends through a ⅞ inch diameter mounting hole in the support pole to channel wiring to the button.
2.Provide push button frame standoff brackets to mount two frames perpendicular on one pedestrian signal pole.
a.A single piece solid aluminum or stainless steel bracket designed for various pole diameters.
b.No additional holes required for mounting.
D.Pedestrian Push Button Sign
1.Provide a 9 inch x 12 inch sign with corner radii that allow the sign to fit completely within the frame.
2.Provide specified two-sided push button sign, one side of the sign with a right pointing finger and arrow and the other side of the sign with a left pointing finger and arrow.
3.Provide sign fabricated from substrate aluminum with retroreflective sheeting. a. Refer to Section 02891 for aluminum substrate and Section 02890 for retroreflective sheeting.
b.Provide standard ANSI 8- 32 clearance holes or eyelets for mounting .
2.7 Conduit
A.Refer to SL Series Standard Drawings.
B.Meet or exceed all conduit manufacturer’s recommendations for materials used in the installation of conduits including sweeps, adapters, couplings, glue, plugs, duct seal, and fittings.
C.Conduit and Fittings
1.Minimum s chedule 40 PVC rated at 194 degrees F as specified in NEMA TC -2, NEMA TC -3, ASTM D 3005, UL Listed.
2.High Density Polyethylene (HDPE) SDR11 rated as specified in ASTM D 3035 with ribbed or smooth interior.
3.Rigid steel as specified in UL -6. Galvanized as specified in ANSI C80.1.
4.Flexible watertight conduit and fittings as specified.
5.Use only pushlock style coupling for connection of HDPE conduit to PVC conduit . Glued fittings will not be accepted.
6.Sweeps – factory manufactured sweeps complete with bell and spigot.
D.Duct Seal - At least 2 inch of d uct seal to seal the conduit and allow the secure fastening of detectable pull tape.
E.Detectable Pull Tape – flat profile, low stretch polyester, detectable, sequential footage marked, 1,200 lbs tensile strength pull tape in each conduit.
F.Backfill
1.Flowable Fill - Refer to Section 03575.
2.Free Draining Granular Backfill Borrow – Refer to Section 02056.
3.Native material – Compact to match existing conditions.
4.Sand
a.Friable natural aggregate, free of loam, detrimental, soluble , or organic matter
b.3/8 inch minus, well graded
2.8 Junction Boxes
A.Refer to SL Series Standard Drawings
B.Underground Junction Box
1.Ring
a.Fused with composite body
b.UV and chemical resistant
C.Grout
1.Non-shrink according to ASTM C 1107
2.9 Power Source and Grounding
A.Refer to SL Series Standard Drawings.
B.Refer to Section 16530.
C.Ground R od Clamps – Acorn with split bolt attachment for each additional wire.
2.10 Pole Mounted Signal Cabinet
A.Refer to SL Series Standard Drawings.
B.NEMA 3R C abinet
1.Sized to adequately house all necessary signal equipment.
2.Fastened to pole with 3/4 inch by .03 inch thick AISI Type 201 stainless steel bands.
3.All connections watertight.
4.Standard Corbin #2 lock assembly.
C.Pedestrian Flashing Beacon Options A & C
1.Cabinet
a.Approximate cabinet size: 20 inch x 16 in ch x 8 in ch
b.Hoffman CSD20168SS or equivalent.
2.Steel Panel
a.Fastened to back of cabinet
b.12 gauge painted
c.Length and width dimensions approximately two inch less than overall cabinet dimensions
d.Hoffman CP2016 or equivalent
3.DIN Rail
a.Length long enough to comfortably accommodate the Supplementary Protectors, Power Supply, Socket for Dial Timing Relay, Socket for Tube Base Relay, and associated wiring, but less than the overall Steel Panel width.
4.Two Supplementary Protectors
a.Single -Pole 15A
b.Allen -Bradley 1492- SPM1C150 or equivalent
5.Power Supply
a.50 W, 12/15VDC
b.Allen -Bradley 1606- XLP50B or equivalent.
6.Dial Timing Relay
a.12/15VDC
b.Set to One- Shot function mode with Signal -On trigger
c.Allen -Bradley 700- HR52TU24 or equivalent.
7.Screw Terminal Socket for Dial Timing Relay
a.Panel or DIN rail mounting
b.Open-style terminal construction
c.Allen -Bradley 700- HN126 or equivalent.
8.Tube Base Relay
a.12VDC SPDT or DPDT
b.PIN terminals
c.Push-to-test
d.Manual override and LED
e.Allen -Bradley 700- HA32Z12- 3-4 or equivalent.
9.Screw Terminal Socket for Tube Base Relay
a.Panel or DIN rail mounting
b.Open-style terminal construction
c.Allen -Bradley 700- HN125 or equivalent.
10.Solid State Relay
a.3.5-32VDC control voltage
b.3-60VDC operating voltage
c.3A rated load current
d.Crydom DC60S3 or equivalent.
11.Alternating Flasher
a.Cube-shape
b.Utah MUTCD- compliant, 50- 60 FPM
c.120VAC solid state flasher
d.2-Channel
e.Panel-mounting with integral heat sink
f.Lights To Go P/N AF1039L or equivalent.
12.Three 6- Circuit Terminal Strip s
a.With adjacent labels on the painted Steel Panel labeled as “Signals”, “Push Buttons”, and “Neutral”
b.Ideal 89- 206 or equivalent.
2.11 Pedestrian Flashing Beacon Option B (Rrfb)
A.Battery for solar controller
1.12V 35Ah valve- regulated sealed lead acid according to manufacturer requirements.
2.12 Mounting Bands and Buckles
A.Refer to SL Series Standard Drawings. B. 3/4 inch wide by 0.03 inch thick AISI Type 201 stainless steel.
2.13 Mast Arm Signs and Sign Mounts
A.Refer to SL and SN Series Standard Drawings.
B.Refer to Section 02891 .
C.Sign Mounting Bracket
1.Pelco Astro Sign -Brac, C able Mount for Overhead Street N ame Signs or approved equivalent.
2.Stainless steel sign clamps .
2.14 Pole Foundation
A.Drilled Shafts . Refer to Section 02466
1.Use Class AA(AE) concrete according to Section 03055.
2.Use coated deformed reinforcing steel according to Section 03211.
B.Grout
1.Dry pack
2.Non-shrink according to ASTM C 1107
2.15 Preemption
A.Emergency Vehicle Preemption (EVP)
1.Contractor provided materials.
2.Equipment make and model to be specified by the project plans or the local Municipality or Fire Department.
B.Railroad (RR) Preemption
1.Contractor provided materials .
2.7-conductor signal cable, according to Article 2.3, Paragraph B of this Section.
Part 3 — Execution
3.1 Preparation
A.Coordinate State Furnished Materials
1.Receive materials at the Department’s Central Warehouse, 4501 South 2700 West, Salt Lake City, UT. Contact the warehouse by calling (801) 965-4060 to schedule a pickup, at least 48 hours in advance.
2.Receive drop shipment materials at the prearranged location.
3.Powder Coated Materials
a.Deliver State furnished materials for powder coating from the Department’s Central Warehouse to the powder coating facility.
b.Deliver State furnished materials from the powder coating facility to the project site.
c.Paint to match hardware attached to powder coated items such as signal pole caps, bolts, and hand hole covers .
d.Powder coat base plate adapters to match signal poles.
B.Notify the Engineer and local traffic enforcement agencies at least 5 working days before any operational change or shutdown of a traffic signal system.
C.Contact local power utility at least 30 days before the connection date. Verify the exact location, voltage, procedure, and materials required by the local power utility.
3.2 Existing Facilities
A.Maintain and work around existing traffic signal equipment until the new or modified traffic signal system has been installed and is operational when existing traffic signal installations are modified or completely rebuilt .
1.Use temporary signal head covers on signal heads and back plates that are not in operation.
2.Do not disconnect or remove an existing signal system until the replacement system is fully functioning.
3.Replace an existing signal damaged during construction within 48 hours.
4.Do not place new mast arms in front of existing mast arms while existing signal is still operational .
B.Obtain approval before removal of operating detection equipment .
1.Notify Engineer at least 48 hours before removal.
2.Engineer may enforce liquidated damages according to the Schedule of Liquidated Damages in Section 00555 if system is taken out of service without approval .
C.Remove and replace t he entire concrete slab to the nearest joints if a portion of a slab is broken or damaged during construction .
D.A uniformed police officer must be on- site during a signal change over.
3.3 Utility Conflicts and Obstructions
A.Modify proposed equipment locations to avoid conflict with underground utilities or other obstructions as required.
1.Obtain approval from the Engineer before modifying locations.
B.Coordinate with the Engineer to field- locate new facilities such as cabinet foundations, camera poles, detector poles, and junction boxes.
C.Field locate equipment with the Engineer :
1.Avoid areas with poor drainage or high potential impact from thrown snow.
2.Place for maximum accessibility and safety for maintenance personnel and vehicles, including a bucket truck .
3.Satisfy clear zone requirements as defined in the AASHTO Roadside Design Guide.
a.Verify right of way limits are not exceeded .
4.Satisfy requirements of applicable UDOT Standard Drawings.
3.4 Excavation
A.Move the excavated material to a location that will minimize obstructions to pedestrian or vehicular traffic , and will not interfere with surface drainage.
B.Protect pedestrian and vehicular traffic from excavation.
C.Remove and properly dispose of surplus excavated material within 48 hours .
D.Do not backfill conduit trenches until inspected by the Engineer.
3.5 Temporary Power
A.Generators used to provide power to a traffic signal must be equipped with an inverter.
3.6 Facilities Taken Out of Service
A.Existing conduits remain in place.
B.Remove conductors taken out of service.
1.Cut conductors, wires, and cables at the end of the conduit if they cannot be removed due to conduit damage.
3.7 Remove and Salvage Existing Equipment
A.Existing traffic signal equipment remains the property of the Department.
B.Verify that the Salvage Existing Equipment Checklist has been placed in the signal cabinet by the Department signal crew before construction.
C.Replace in kind equipment damaged during the removal or transport process .
1.Equipment will be returned within 72 hours of removal to the region signal office.
D.Remove foundations to a depth of at least 12 inch below the existing surface.
E.Remove and properly dispose of abandoned junction boxes.
F.Backfill holes with local material , compact to the density and thickness of the surrounding material , and cap with material that matches the surrounding material.
3.8 Construct Pole Foundation
A.Refer to SL Series Standard Drawings.
B.Do not weld reinforcing steel, anchor bolts, or conduit.
1.Use tie wire to secure conduit.
2.Use template to align and secure drop in anchor s.
C.Do not mount steel on foundations until they have been placed for at least 10 days or attained 75 percent of the specified 28- day compressive strength based upon field cured cylinders .
D.Install stainless steel foundation depth identification tag in foundations 14 ft deep according to SL Series Standard Drawings.
3.9 Cabinet Base and Cabinet Installation
A.Refer to SL Series Standard Drawings .
3.10 Anchor Bolt Pretensioning
A.Tighten top nuts, followed by bottom nuts, to a snug- tight condition before loading.
B.Retighten all nuts to a snug- tight condition after the structure is fully loaded.
C.Pretension anchor bolts by the turn of the nut method by turning the top nuts 1/3 turn beyond snug- tight condition for anchor bolts ≤ 1 ½ inch diameter, and 1/6 turn beyond the snug- tight condition for anchor bolts > 1 ½ inch diameter .
D.Tighten anchor bolt nuts according to SL Series Standard Drawings for poles with breakaway slip base systems.
3.11 Signal Pole and Mast Arm Placement
A.Install signal pole to be plumb after mast arm is attached.
1.Rake pole to level mast arm.
2.Do not rake the signal pole to increase signal head clearance.
B.Field assemble multi -section mast arm slip joint s to achieve a snug fit.
1.Apply anti -seize compound and provide overlap not less than 1½ times inside diameter of end section.
3.12 Directional Boring and Trenching for Conduit
A.Directional Boring
1.Use d irectional boring for conduit installation on roadway crossings unless otherwise approved.
B.Trenching Paved Surface 1. Refer to SL Series Standard Drawings .
2.Do not trench through paved surface without approval from the Engineer.
3.Maximum trench width: 6 inch.
4.Use flowable fill to bottom of pavement or to within 3 inch of the roadway surface when pavement is less than 3 inch thick.
5.Apply tack coat evenly before final backfill when surface is asphalt.
6.Match the composition, density, and elevation within ± 3/16 inch of the existing pavement section.
C.Trenching Unpaved Surface
1.Provide sand backfill around conduit and 6 inch above conduit in trench.
2.Backfill trench above sand to finished grade. Use backfill that matches the composition, density, and elevation of the existing surface.
3.Install conduits that pass under finished curbs and gutters, sidewalks, concrete flatwork, textured or decorative surfaces by jacking, drilling, or pushing.
D.Minimum Conduit Cover
1.Refer to SL Series Standard Drawings.
3.13 Install Conduit
A.Place all conduits in the same trench before surfacing.
B.Use PVC or HDPE conduit underground as shown.
C.Seal uncapped conduit ends inside junction box with at least 2 inch of duct seal.
D.Do not use a torch for bending or shaping PVC conduit.
1.Use equipment specifically designed to heat PVC conduit to shape required curves or radii.
E.Do not exceed 270 degrees of conduit sweeps between junction boxes.
3.14 Install Junction Box
A.Refer to SL Series Standard Drawings.
B.Provide at least 10-inch spacing between adjacent junction boxes.
3.15 Install Wiring
A.Conductors
1.Clean and dry the inside of the conduit before installing conductors and cables .
2.Install grounding conductor in circuit conduits with 50 V or higher voltage.
3.Use approved lubricants when pulling conductors and cables in conduit.
4.Pull conductors and cables with pull tape.
5.Tape the ends of unused conductors and label them as spares.
6.Land wires according to SL Series Standard Drawings.
B.Bonding Conductor (Ground)
1.Run continuously and bond to each metal signal pole or luminaire pole.
2.Attach one wire around the signal pole base bolt with a washer. Each additional wire will be attached with a split -bolt.
3.Bond the grounding system conductor to the ground rod in each junction box where 50 V or greater is present.
a.Ground rod clamps (acorns) are required for connecting the bond/ground wire to the ground rod.
b.Only (1) wire per clamp is allowed. Only (1) clamp per ground rod is allowed.
c.Combine a dditional wires using split -bolts.
d.Wire terminal busses of any type are not allowed in signal related junction boxes or poles.
C.Arrange the wiring neatly within enclosures such as cabinets, junction boxes, and fixtures.
1.Provide at least 6 ft of slack cable (for all cables) at every junction box that cable passes through.
2.Provide at least 25 ft of slack cable at the nearest junction box for cables connecting to pedestrian signal poles .
D.Terminate terminal connections with a mechanical (spade) connector.
E.Provide a separate 7- conductor cable for signal heads that control a dedicated turn phase.
F.NEC requires no more than 40 percent of conduit be filled with cables . In cases where more cable is required conduit size or quantity may be increased for that specific crossing.
G.Mark cabinet cables with colored vinyl electrical tape as specified in Table 1. Table 1 Cables Marked with Colored Tape Northbound Southbound Eastbound Westbound Signal Circuit Blue Red Yellow Orange Detector Circuit Blue Red Yellow Orange Circuit Coding One band = Through, Two bands = Left Turn, Three bands = near /far side Detection : One band = Stop Bar, Two bands = Advance Pedestrian Head Circuit Blue and Green Red and Green Yellow and Green Orange and Green Pedestrian Button Circuit Blue Red Yellow Orange Ped Pole Blue/white Red/white Yellow/white Orange/white
3.16 Install Power Source
A.Refer to Section 16530 and SL Series Standard Drawings.
3.17 Install Luminaire
A.Refer to SL Series Standard Drawings.
3.18 Install Signal Head
A.Refer to SL Series Standard Drawings.
B.Install optically -programmed vehicle signal heads according to the manufacturer ’s instructions.
C.Install signal head so no more than half its height is above the center of the mast arm.
1.Standard signal head clearance heights must be met.
3.19 Install Pedestrian Signal Heads and Push Buttons
A.Refer to SL Series Standard Drawings.
3.20 Install Mast Arm Sign
A.Attach mast arm sign with mounting brackets using stainless steel straps.
B.Mount sign on mast arm so that the legend/message is horizontal even if on a curved section of mast arm.
3.21 Install Radar Detection
A.Install , aim, and terminate radar detection 24 hours before signal turn- on. Contact the Engineer for assistance with detection area locating.
B.Install auxiliary ground wire f rom all stop bar radar units to the signal cabinet (not needed for dilemma zone or queue clearance r adar detection).
1.Attach wire to the radar unit exterior grounding lug with forked spade and to the grounding bus in signal cabinet .
2.Auxiliary ground wire may be spliced at the radar unit home- run splice point within the splice kit. a) Ground wires may be combined at splice points to maintain one ground wire per roadway crossing.
C.Install an auxiliary power cable to limit voltage drop, for radar unit installations over 500 feet from the signal cabinet (as measured by cable length) .
1.Land the auxiliary power cable at the cabinet and splice point as follows :
a.Black to Black radar unit port/wire.
b.Clear to Red radar unit port/wire.
3.22 Signal Turn- On
A.Complete the UDOT Signal Turn- On Checklist before scheduling the in- progress signal inspection.
1.Obtain checklist from the Engineer or online: http://www.udot.utah.gov/go/standardsreferences
2.Provide justification and obtain written acceptance from the Engineer for checklist items required before turn- on not checked “Y”.
B.Contact t he Engineer to schedule the in- progress signal inspection with the Region Signal Supervisor at least 7 days before turn-on.
C.Notify the Engineer at least 5 days before signal turn- on.
D.Turn-on is not considered complete until IT S fiber optic communications are functional according to Section 13594.
E.Only the Department is permitted to turn on traffic signals.
3.23 Traffic Signal Maintenance During Construction
A.Maintenance and operation of permanent traffic signals during construction is the responsibility of the C ontractor . Refer to Section 01554 for changes to timing, phasing, detection , or any other settings in the signal controller for permanent traffic signals .
1.Maintain communication to signal during construction.
B.Provide emergency maintenance on a 7- day per week, 24 hour basis until substantial completion of the project .
1.Respond within 15 minutes and be on- site within 30 minutes plus travel time when contacted by the dispatcher .
2.Provide contacts and telephone numbers to the Engineer for the emergency service.
C.Initiate other non- emergency repairs within 24 hours of notice.
3.24 Install Railroad Preemption
A.Installation of a new signal within 500 ft of an at -grade railroad crossing requires coordination with the Engineer on how to address preemption.
B.Install 7 -conductor signal cable between the signal cabinet and the railroad signal house.
1.Railroad signal house connections to be completed by the railroad owner .
C.Coordination on preemption adjustments f or existing signals with r ailroad preemption, is required for any work which results in:
1.Signal phasing or timing changes
2.Geometric changes (widening)
3.Rail crossing modifications
3.25 Pedestrian Flashing Beacon Option B (Rrfb)
A.Install according to manufacturer installation instructions and as shown. Refer to SL Series Standard Drawings.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 796–814 of 1,331.