616TRAFFIC SIGNALS

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of furnishing and installing traffic signals, pedestrian signals, or flashing beacons including poles,

mast arms, foundations, backfill, and all necessary fittings, cables, and components as ordered.

1.2Traffic signal terms shall be in accordance with those defined in the MUTCD.

Materials

2.1A list of the recommended materials required to install the system may be included as an amendment to this specification,

but the Department will give no guarantee as to the completeness of this list. 2.1.1 Electrical materials shall meet the standards herein, local and utility codes, and the National Electrical Code, where applicable. 2.1.2 Drawings, manufacturer's specifications, and applicable catalog cuts for all materials and components shall be submitted in accordance with 105.02 within 21 days after award of the Contract. An additional set of final approved documents, to total 6 sets, shall be supplied to the Engineer.

2.2Traffic Signal Heads.

2.2.1 Housings. Housings shall be constructed of die cast aluminum or polycarbonate with a smooth outer surface and shall be capable of holding the optical units securely in place. Housings shall be adaptable for pedestal, bracket, or rigid mast arm vertical or horizontal mounting. The assembled housing shall be dust proof and moisture proof. Each housing shall be equipped with a hinged door of die cast aluminum or polycarbonate to hold the lens and parts of the optical units. The doors shall be designed to ensure uniform pressure around the doorframe when closed. Doors shall be fastened by hinged wing nut assemblies or other approved fasteners. Unless otherwise indicated on the plans, lenses shall be furnished with approved tunnel viso rs (not less than 10” ). If either longer visors than those specified above or louvers are deemed necessary, they shall be furnished and installed. All traffic signals shall be furnished with a 5 ” backplate. Backplates shall be louvered aluminum coated flat black, be fastened with stainless steel hex head slotted screws and a 3/16” by 3/4” stainless steel fender washer. 2.2.1.1 The assembled housings shall be made up of individual sections fastened together with bolts. The assembly of sectional units shall present a smooth unb roken contour of pleasing appearance. Each end of the housing assembly shall have an opening for a 1-1/2” pipe nipple. The area around this opening shall be reinforced and serrated so that lock nuts will seat firmly. 2.2.1.2 One cap shall be supplied wit h each assembled housing to act as a cover over the hole in the top to prevent water from entering. 2.2.2 Housing adapters. Housing adapters for pedestal mounting shall be constructed of cast iron. They shall be adjustable with serrated surfaces to permi t the housing to be locked in the desired horizontal position. The adapters shall be secured to the bottom of the housing by means of a close nipple, shall slip fit at least 7 ” over a standard traffic signal post 4 ” in diameter, and shall be secured to th e post by a minimum of four set screws. Adapters shall contain raceways from the housing to the post to protect the wires from the elements. 2.2.3 Mast arm brackets. Mast arm brackets shall be banded (not cabled) as indicated in the recommended list of materials shown in the proposal. 2.2.4 Lamps. LED lamps shall have a regulated power supply designed to electrically protect the diodes. The lamp shall be water tight and sealed to eliminate contaminants. The lamp shall be capable of operating at ambient air temperatures of -40° F to 140° F. 2.2.4.1 Each LED module shall be wired with two leads which shall terminate at the terminal block in each signal head. Separate leads shall be used to wire the block to the base. Leads shall be 18 AWG stranded wire. All colors shall be bright and clearly defined and cover the insulation the entire length of the lead. The color of these leads shall be as follows:

2.2.5 Optics. LED lamp life shall be a minimum of 100,000 hours of continuous operation. Power consumption for 12” indications including power supply shall not exceed 20 W and have an initial output of 1900- limens. 2.2.5.1 LED modules shall conform to the standards set forth by the Institute of Transportation Engineers and shall be of the color indicated, circular in shape, with a visible diameter of approximately 12”.

New Hampshire Department of Transportation Standard Specifications – 2016

2.3Pedestrian Signal Heads.

2.3.1 General. Pedestrian signal heads shall be LED type conforming to the Institute of Transportation Engineers Standard for Adjustable Face Pedestrian Signal Heads. The LED aluminum pedestrian signal displays bright and uniform symbol message “ HAND” in portland orange and “ WALK PERSON” in lunar white. Both messages shall be contained in a single section head. 2.3.2 Housings. Housings shall be one piece die cast aluminum or polycarbonate complete with top, bottom, sides, and back. For mounting purposes, the top and bottom of the housing shall have openings to accommodate standard 1-1/2” pipe brackets. The outside surface of the openings shall be serrated to provide for positive positioning of the housing. Doors and fasteners shall be as specified in 2.2.1. The completed assembly shall be dust and moisture proof. Each housing shall include a solar screen visor installed parallel to the face of the “ HAND/WALKING PERSON” symbol. The solar screen assembly consists of a minimum of 20 straight horizontal louvers and 21 zigzag pattern louvers. The solar screen visor assembly shall be held in place using stainless steel screws. 2.3.3 LED Modules. Each LED module shall consist of an assembly that utilizes LEDs “ RAISED HAND ” and the “ WALKING PERSON” modules as the light source in lieu of an incandescent lamp. Pedestrian LED modules shall be Engineered to fit in all ITE compliant conventional cast aluminum pedestrian signal housings. Each LED Module shall utilize appropriate technology to achieve the required colo r and shall be the ultra-bright type rated for 100,000 hours of continuous operation from - 40° F to 165° F. Each individual LED module shall be wired such that a catastrophic loss or failure of one LED will result in the loss of not more than 5 percent of the signal module light output. The modules shall be rated for a minimum useful life of 48 months. All wiring and terminal blocks must meet the requirements of Section 13.02 of the ITE Publication Equipment And Material Standards, Chapter 2 (Vehicle Traffic Control Signal Heads ). 2.3.3.1 Each LED module shall feature two 39” long 20AWG minimum wire lead with strain relief and spade terminals for connection to the terminal block of the signal heads. One of the conductors shall contain white insulation to signify neutral. The color of other conductor shall be different and shall be used to differentiate between the “ RAISED HAND” and the “ WALKING PERSON” LED modules. The two conductors shall be 600 Volt, 20 AWG minimum, jacketed wires conforming to the Na tional Electric Code, rated for service at 220° F. Each LED module shall incorporate a printed circuit board containing all required LEDs and circuit components. 2.3.4 Lenses. The external lens surface shall be smooth with no raised features, so as to m inimize the collection of dirt, debris, and other particulate contaminants, which may impact luminous intensity, and to facilitate periodic cleaning. External lens facets are prohibited. Both the “ RAISED HAND” and the “ WALKING PERSON” LED modules shall be filled with LED’s to give the appearance that the entire image is illuminated when energized. Outlined images will not be permitted. The height of the “ RAISED HAND” and the “ WALKING PERSON” images on the module shall not be less than 10” and the width of each image shall not be less than 7 ” The uniformity ratio of an illuminated symbol shall not exceed 4 to 1 between the highest luminance area and the lowest luminance area in the module. 2.3.5 Count Down Timers. The countdown timer if required sha ll be 16” by 18” module, LED overlaid filled countdown style with the filled hand/man on the left and the countdown on the right. The module shall only operate in clearance cycle countdown mode. The module will start counting when the flashing clearance signal turns on and will countdown to “ 0” and turn off when the steady “ Don’t Walk” signal turns on. The units shall not have any external attachments, dip switches, toggle switches or options that will allow the mode to be changed from counting the clearance cycle, to the full walk/don’t walk cycle or any other modification to the icons or digits. The control and regulation module shall be of the “ smart” type in order for the countdown displays to be automatically adjusted with the programmed intervals of the traffic controller. At power on, the module enters a single automatic learning cycle. During the automatic learning cycle, the countdown display shall remain dark.

2.4Traffic Signal Poles, Mast Arms, and Pedestals.

2.4.1 General. Traffic signal structures shall be designed in accordance with the AASHTO “ Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals”. Traffic signal mast arms shall be designed to support all proposed components as shown on the plans. Minimum clearance to the bottom of overhead signal housings shall be 16 ft. Signal mast arm structures shall be designed based on the following criteria: Basic Wind Speed: 100 mph Design Life: 50 Years Fatigue Importance Category: Category II Natural Wind Gust Loading shall be considered Truck Induced Gust Loading, Galloping Loads and vortex shedding effects do not need to be considered. 2.4.1.1 Steel structures, unless otherwise indicated, shall be hot dip galvanized in accordance with AS TM A 123. 2.4.1.2 Concrete foundation shall be concrete Class B meeting the requirements of Section 520. Reinforcing steel shall meet the requirements of Section 544. The foundation shall be as shown on the plans.

New Hampshire Department of Transportation Standard Specifications – 2016 2.4.1.3 Anchor bolts shall conform to ASTM A 36/A 36M, Grade 55, having minimum yield strength of 55 ksi with threaded end and hex nuts (2 per bolt), galvanized in accordance with ASTM A 153. 2.4.1.4 Mast-arm structure and foundation (when required) design calculations and shop drawings shall be submitted for documentation in accordance with 105.02. 2.4.1.5 Wood poles shall be Class IV, with a fiber bending stress of 8,000 psi, to a length specified conforming to Rural Electrification Administration (REA) Specification DT-5C. 2.4.1.6 Messenger cable and guy cable shall be seven strand wire with a breaking strength of 8,000 pounds, double galvanized in accordance with AASHTO M 111.

2.5Traffic Signal Controllers and Cabinets.

2.5.1 General. The controller shall operate on 120 volt, 60 hertz (cycle) alternating current, and shall be delivered completely wired and enclosed in a weatherproof cabinet. All components shall be new, and unless noted, the use of solid state components shall be required. Controllers shall be programmable, menu driven, traffic actuated complying with NEMA Standard TS -1, with time base coordination module, overlaps internally generated by means of an overlap card as per NEMA Standard TS-1, with wire jumpers on a printed circuit board, internal Fire pre -emption module with “ D” connector harness and capable of providing an exclusive pedestrian phase as part of a phase. 2.5.1.1 Bench test. All components of the controller and cabinet shall be bench tested for a minimum of 72 continuous hours by the Contractor at the Contractor’s facility prior to delivery to the project. A representative of the Bureau of Traffic shall verify the test check list. The Contractor shall notify the Engineer at least 3 days prior to testing as to the date, time and place that tests are to be performed. Testing shall be performed by a qualified Signal Technician using a testboard and in conformance with t he design loads, phasings, timings and auxiliary equipment such as pre -emptions and pedestrian phases. Any defective component shall be replaced, retested and continuous testing continued. Test results shall be documented on a check list as provided b y the Bureau of Traffic and these results attested by the signature of the performing technician. Upon completion of satisfactory bench testing, a written approval will be supplied to the Contractor by the Engineer for delivery to the project only. This approval does not relieve the Contractor from ensuring proper operation of the equipment. The approval shall accompany the cabinet and controller when delivered to the project. 2.5.1.1.1 The checklist will contain the following items:

sequencing, timing and returning to rest condition. Only one separate call for each phase shall be used.

called for sequencing, timing and returning to rest condition.

Optical Detector - With the receivers wired in the cabinet and using an emitter, test each fire run as per the plans. Radio Detector - With the receiver wired in the cabinet and using an external radio transmitter, test each fire run as per the plans. Hard Wired - Attach a temporary push button as per the plans and test each fire run as per the plans.

Simulate closing the calling circuit, either manually or electronically to call up the Railroad pre -emption, then check and verify that the sequencing, timings and intervals are as per the plans.

displayed Green or Yellow and to the other non-parent Greens or Yellows to ascertain that conflicting colors are not present. When all of the above procedures have been completed, the performing technician shall document the results on the approved form as provided by the Bureau.

New Hampshire Department of Transportation Standard Specifications – 2016 2.5.2 Controller cabinet. Controller, timing and flashing mechanisms, circuitry, and other components shall be enclosed within a weather tight 1/8 ” thick aluminum “ P” type cabinet with 2 shelves, side and back panels, a main door and a switch compartment door on a 12” aluminum extension base. All exterior seams shall be continuously welded. 2.5.2.1 Two adjustable “ C” mounting channels to allow for positioning of panels and shelves shall be installed on both side walls and back of the cabinet. 2.5.2.2 The two adjustable equipment shelves shall span the entire width of the cabinet. No part of the back panel shall extend above the equipment shelves. 2.5.2.3 The cabinet door shall be a minimum of 80% of the front surface area and shall be hinged on the right side with a continuous hinge. The cabinet doorframe shall be flanged on all four sides with a light/alarm switch bracket located in the upper right hand corner. The latching mechanism shall be a 3 -point draw roller type made of steel with a center catch. The operating handle shall have provisions for padlocking in the closed position. The main lock shall be a Corbin 1548-1 and furnished with two number 2 keys. The door shall have a gasket that forms a weather tight seal between the door and the cabinet. The lower portion of the door shall be vented with louvers on the ext erior to provide 100 cfm of air flow. A filter held firmly in place by sid e and bottom brackets shall cover the louver vents on the door’s interior. A door restraint shall be furnished to prevent door mov ement during windy conditions. 2.5.2.4 The exterior of the cabinet shall be natural aluminum. The interior surface of the cabinet and door, including shelves shall be painted with appliance white alkyd baked enamel paint. 2.5.2.5 A switch compartment with removable back plate shall be furnished on the main door. The compartment door opening shall be flanged on all sides. The compartment door shall be hinged on the right side with a continuous hinge and have a gasket that forms a weather tight seal when closed. A compartment door lock Corbin RS57565 with key hole cover and two keys shall be furnished. The switch compartment shall contain:

2.5.2.6 A ventilation fan powered by a 115 volt single phase motor and rated a t an air flow of 100 cfm shall be installed at the top of the cabinet. The screened exhaust vent shall be vented between the top of the cabinet and the door. The ventilation fan shall be controlled by means of a thermostat with a range of 70 to 160 ° F with overload protection and noise suppressor. 2.5.2.7 A cabinet heat lamp of 100/150 watts shall be installed. The heat lamp shall be controlled by a thermostat located on the left side of the cabinet with a range from 0 to 50 °F. 2.5.2.8 The cabinet power panel shall be installed on the right side of the cabinet 8” up from the mounting flange. It shall have a 30 amp and a 15 amp circuit breaker. The 15 amp breaker shall service the GFI duplex outlet, a switched light outlet, the heat lamp and the ventilation fan. The 30 amp breaker shall service all other items. The GFI outlet shall be mounted on the power panel. The switched light outlet shall be mounted on the upper right side. An AC line filter and ISTROL series line filter for controller and conflict monitor and lightning/surge suppressor shall be installed on the power panel. 2.5.2.9 Cabinet trouble light shall be a stainless steel, flex shaft type, 18” in length with on/off switch. Trouble light shall be mounted on the right-inside of the cabinet. 2.5.2.10 The cabinet shall be furnished with a plastic print holder and 3 sets of cabinet prints showing all wiring. Print holder shall be mounted on the inside of the door. 2.5.2.11 Cabinets shall be furnished with 10 self -tuning loop detector amplifiers. Loop detector amplifiers shall have as a minimum 4 operating frequencies, 15 levels of sensitivity, a sensitivity boost for small and high vehicles, internal loop diagnostics and LED fault indicators identifying and differentiating between an open or shorted loop, or a sudden 25 percent change i n inductance and a RS232 serial port. 2.5.2.12 Vehicle Detection Panel. The vehicle detection panel shall be installed on the left side of the cabinet; the bottom edge shall be 10” from the mounting flange. Loop field terminals shall be protected from in ductive transient surges by 150 V, 10 A Metal Oxide Varistor. All detector terminals shall be identified by number and shall correspond with the cabinet print. A ll detector harnesses shall be labeled as to phase and shall be a minimum of 6 ft. in length and neatly dressed.

New Hampshire Department of Transportation Standard Specifications – 2016 Detector panel for Type M cabinet shall be supplied with 6 harnesses wired as follows:

Detector panel for Type P cabinets shall be supplied with 10 harnesses wired as follows:

2.5.2.13 Load Switch. The cabinet shall be supplied wi th 12 solid state cube type load switches with a 10 A rating meeting the requirements of NEMA TS-1. Load switches shall be provided with LED indicators on both input and output sides to indicate the state of the circuit on the load switch. 2.5.2.13.1 The back panel shall have 12 load switch sockets completely wired including conflict monitor. All terminals shall be labeled for identification corresponding to the back panel print. Load switch sockets shall be wired as shown below . Load Switch Socket Phase Assignment 1 Phase 1 2 Phase 2 3 Phase 3 4 Phase 4 5 Phase 5 6 Phase 6 7 Phase 7 8 Phase 8 9 Pedestrian 10 Overlap A 11 Overlap B 12 Overlap C

2.5.2.14 Flash Transfer Relays. The cabinet shall be supplied with 6 flash transfer relays that meet the requirements NEMA Standard TS-1. 2.5.2.14.1 The back panel shall have 6 flash transfer relay sockets completely wired and assigned as shown below: Relay Assignment Flash Relay 1 Load Switch 1 and 2 Flash Relay 2 Load Switch 3 and 4 Flash Relay 3 Load Switch 5 and 6 Flash Relay 4 Load Switch 7 and 8 Flash Relay 5 Load Switch 9 and 10 Flash Relay 6 Load Switch 11 and 12

2.5.2.15 Signal Flasher. The cabinet shall be supplied with one (1) NEMA Type 2 solid state cube type signal flasher mounted on the back panel. 2.5.2.16 Pedestrian/Vehicle Detector Test Panel. A pedestrian/vehicle detector test panel shall be surface mounted on the interior side of the cabinet door. A push type test button shall be labeled and furnished for each phase. Pushing the button shall

New Hampshire Department of Transportation Standard Specifications – 2016 cause a detector call to be placed on the controller for as long as the button is held. Test panel wires shall be enclosed i n a cable harness. 2.5.2.17 Controller On/Off Switch. A controller on/off switch shall be surface mounted on the int erior side of the cabinet door or in the upper right hand side of the cabinet. 2.5.2.18 Conflict Monitor. A 12-channel conflict monitor with liquid crystal display meeting current NEMA Standard TS-1 requirements shall be provided in the cabinet. The liquid crystal display shall have the capability of showing all 4 possible signals per channel. The monitor shall retain complete information on the last 9 events including which channels were active, the da te and the time. The assignment of conflicting channels shall be by means of a standard NEMA program card. The monitor shall be wired to detect absence of voltage on all channels. The monitor shall have as RS232 serial port for down loading. Monitor channels shall be assigned as shown below: Channel 1 Phase 1 Channel 2 Phase 2 Channel 3 Phase 3 Channel 4 Phase 4 Channel 5 Phase 5 Channel 6 Phase 6 Channel 7 Phase 7 Channel 8 Phase 8 Channel 9 Pedestrian Channel 10 Overlap A Channel 11 Overlap B Channel 12 Overlap C

2.5.2.18.1 Monitor Interlock Relay. The cabinet shall be wired to detect the presence of the conflict monitor. Disconnection of the conflict monitor from its harness shall cause the intersection to go into flash. 2.5.2.19 Fire Pre-emption. Fire pre-emption shall be activated by optical dete ction equipment with optical detectors. Fire pre-emption shall clear the existing phase through a normal clearance followed by the fire phase as shown on the plans for the minimum time specified. The fire phase shall give a green in the called direction. The confirmation light and siren (if used) shall be activated only during the fire pre- emption phase, after the call phase is satisfied. Upon release of the fire pre- emption, the controller shall provide a green to the major movement. 2.5.2.19.1 The Engineering, design, and integration of the fire pre-emption shall be by the manufacturer of the equipment, in cooperation with the supplier of the signal controller equipment. 2.5.2.19.2 The confirmation light shall be operated by a solid state load switch cube surface mounted on a panel located on the left side of the cabinet. No back panel load switches shall be used for the confirmation light. 2.5.2.19.3 Confirmation light shall be a self-contained 120 volt AC industrial strobe light beacon with a weather -resistant, fully enclosed, rugged, cast aluminum base and Lexan red optic lens. 2.5.2.19.4 Optical detector locations shall be verified by the Engineer to assure optimum reception. Optical detector cable shall run unspliced from the optical detector head to the controller cabinet. 2.5.3 Contacts. All contacts used in connection with interval indications shall be of pure coin silver or equivalent, and shall be capable of breaking and carrying 10 A at 125 V alternating current. The contacts shall be readily accessible and capable of being replaced in the timer without the use of any tools other than pliers and screw driver. 2.5.4 Flashers. Intersection beacon flashers shall be housed in an approved cabinet containing: 25 A NEMA cube -type flasher, 10 A circuit breaker, and disconnect switch. All components shall be completely wired and mounted within the cabinet. Painting shall be in accordance with 3.12. 2.5.5 Pedestals. Meter pedestal shall be as indicated on the plans. 2.5.6 Radio and television interference. Electrical equipment shall be prevented from interfering with radio and television reception.

New Hampshire Department of Transportation Standard Specifications – 2016

2.6Cable and Wire.

2.6.1 General. Cable shall be plastic covered cable meeting the applicable requirements of the International Municipal Signal Association (IMSA) specifications. The conductor color coding shall not be by means of printed code. Actual color coding shall be used. 2.6.2 The minimum size wire for the circuits shall be as follows: Service A.W.G.#

2.6.3 Detector loop lead-in cable shall be shielded, single pair, stranded conductors with a drain wire enclosed in polyethylene jacket conforming to the requirements of IMSA 50-2. The use of cables carrying more than one pair of conductors is prohibited. 2.6.3.1 Each lead-in cable shall be marked with plastic tape corresponding to the following color code to identify which phase it pertains to at the splice(s) in both the pull box(es) and in the cabinet. PHASE COLOR CODE Phase 1 1 Blue Phase 2 1 Green Phase 3 1 Yellow Phase 4 1 Red Phase 5 2 Blue Phase 6 2 Green Phase 7 2 Yellow Phase 8 2 Red

2.7Conduit. Traffic signal conduit, pull boxes, frames, and covers shall conform to 614.2.

2.7.1 Conduit for all lines, e xcept the service, shall be 3 ” in diameter. Service conduit shall be rigid steel conduit 1 -1/4” inside diameter.

2.8Painting. Prior to erection and assembly, if not manufactured of polycarbonate material, the entire traffic or pedestrian signal

housing and visors shall be painted with an approved zinc-rich primer and a finish enamel coat of federal yellow No. 13538. The door face and inside visor shall be federal black No. 17038.

2.9Backfill for foundations, unless otherwise ordered, shall be material conforming to the requirements of 209.2.1.2 - Granular

Backfill-Gravel. Construction Requirements

3.1All traffic signal and electrical installations shall comply with the requirements specified herein, local and utility codes,

MUTCD, and the National Electrical Code (NEC). 3.1.1 A preconstruction meeting with the Contractor, signal Subcontractor , Engineer and Bureau of Traffic representative shall be arranged not less than 3 days prior to the start of signal installation, to resolve any problems. 3.1.2 The signal Subcontractor shall notify the NHDOT Bureau of Traffic, Signal Design Section no less than 3 days prior to final inspection of signal installation. This final inspection is required prior to signal activation.

3.2Each signal head mounted on a mast arm shall be installed with a 1/8 ” diameter aircraft. cable, looped around the mast arm

and mast arm bracket, as a safety device to prevent the signal head from falling. Cable ends shall be fastened by two opposi ng “ U” clamps. When suspended by this cable, the top of the signal head shall be no more than 6 ” below the bottom of the mast arm.

3.3Conduit lines. All conduit lines necessary shall be constructed for the proper operation of the signals and shall conform to

614.3. 3.3.1 All conduits terminating in the cabinet shall be sealed with duct sealant.

New Hampshire Department of Transportation Standard Specifications – 2016

3.4Concrete foundations with anchor bolts to secure the traffic signal structures, flasher or controller cabinets, and meter

pedestals, shall be installed at the locations specified. When directed, the concrete foundation for the controller cabinet shall be raised to any height up to 18” above the surface. Chamfer strips shall be used on all signal controller cabinet foundations. Forms shall be inspected before concrete is placed. 3.4.1 Poles shall not be mounted on the leveling nuts until the concrete has cured for at least 7 days or attained a minimum of at least 80 percent of its design compressive strength. 3.4.1.1 Provide protection for wiring from rodents and other elements as approved by the Engineer and/or as shown on the Plans. 3.4.2 Prior to placing the controller cabinet on its foundation, silicone sealant shall be applied to the area of contact. 3.4.3 The Contractor shall use bolt pattern templates when setting mast-arm anchor bolts, signal pedestal bolts and controller cabinet mounting bolts. The templates shall remain in place for a minimum of 24 hours. 3.4.4 Wood poles shall have the butt end buried in the ground to a depth of 8 feet. 3.4.5 Wood poles with back-guy cable shall have the butt end of pole buried 8 ft. into the ground. Poles shall be back-guyed using a 10-inch expanding anchor with 3/4” by 96-inch anchor rod. Thimble eyes of anchor rods shall extend 12 ” above ground. Cable used for back-guying shall be attached to the anchor rod by short bail automatic type grip and to the guy hook on the pole by a preformed type grip. Pole shall be drilled 14” from top and a 5/8” oval eyebolt installed with one square flat washer and square nut on the messenger side and one square washer, square nut and guy hook on the opposite side.

3.5Inductive Loop Detectors.

3.5.1 Loop installation shall follow these specifications and the Loop Detail Sheet as to colors, connections, splicing kits, step procedures and materials used. 3.5.1.1 Curb entry. Nonmetallic conduit shall be utilized from the pull box to its intercept with the saw cut. The visible portion of the curbing shall not be cut for conduit installation. The chase from the saw cut to the splice box should extend no more than 1 ft. from the curb. Conduit shall be installed so that it directly receives the lead-in wire. 3.5.1.2 Saw cut. The saw cut shall be a clean, well-defined 5/16” wide cut and done without damaging the adjacent pavement. The sa w cut depth shall be at least 1 -3/4” for asphalt and 1- 1/4” for concrete. The saw cuts shall be overlapped to provide full depth at all corners, and all slots requiring a right angle turn of wire shall be cut at a 45 degree diagonal angle. Prior to the installation of wire, the saw cuts shall be checked for the presence of ragged edges or protrusions, and cleaned and dried. Cutting dust, grit, oil, moisture, or other contaminants shall be removed. 3.5.1.3 Loop wire installation. All loop installationss hall be made without damage to the wire or its insulation. All damaged wire shall be replaced. The loops shall be installed as per plans, and shall contain the required number of turns as shown or as recommended by the manufacturer. 3.5.1.3.1 The wire shall be laid in the slot so that there are no kinks or curls and no straining or stretching of the insulation. Loop wire shall be installed as far down in the slot as possible, using a blunt object similar to a wooden paint stirrer, to seat the loop wire, but in no case shall a screwdriver or other sharp tool be used for this purpose. The loop lead- in wires shall be twisted to provide a minimum of one turn per foot from the loop to the pull box. 3.5.1.3.2 A minimum of 3 ft. of slack shall be coiled and sto red in the pull box. Where the loop wire crosses cracks or joints in the pavement, plastic sleeving shall be used to insulate the wire, to a minimum of 4 ” on either side of the crack or joint. 3.5.1.4 Initial Testing. Prior to pouring sealant, the detector loop and loop lead- in cable shall be checked for continuity, inductance, resistance and integrity of the insulation. The tests shall be made in the presence of the Engineer and results shall be recorded on the as-built plans in the space provided. If the results of the measurements fall outside the specified range for one or more tests, the Contractor shall replace any portion or all of the system until proper readings are obtained. 3.5.1.4.1 The inductance of each detector loop lead -in cable system sh all be measured at the controller cabinet with the drain wire connected to ground. The inductance of each detector loop lead -in in the system shall be between 175 to 500 µH. 3.5.1.4.2 The DC resistance of each detector loop lead -in cable shall be measured at the controller cabinet. The DC resistance shall be between 2 to 6Ω. 3.5.1.4.3 The resistance of each conductor to ground in the detector loop lead -in cable shall be measured by leaving the other conductor free and the drain wire connected to ground. This resistance shall be a minimum of 10 M Ω under any weather and moisture conditions.

New Hampshire Department of Transportation Standard Specifications – 2016 3.5.1.4.4 The resistance of the drain wire to ground in the detector loop lead -in cable shall be measured by leaving both conductors free and all other drain wires disco nnected from ground. This resistance shall be a minimum of 10 M Ω under any weather and moisture conditions. 3.5.1.4.5 The integrity of the insulation shall be checked by applying a meg -ohm meter between each end of the detector loop lead-in and the neares t reliable electrical ground. In the event that no available ground exists, a suitable ground shall be established for the measurement. The meg-ohm meter reading shall be a minimum of 10 MΩ under all conditions. 3.5.1.5 Sealant. Saw cut sealant shall be an approved flexible embedding sealant as included on the Qualified Products List maintained by the Bureau of Materials and Research used strictly in accordance with the manufacturer's instru ctions. The sealant shall be poured into the slot to half depth, checked for air bubbles or material pile up, and then filled to the roadway level. Excess sealant shall be removed by means of a squeegee, and in any case, neither a trough nor a mound shal l be formed. Sufficient time shall be allowed for the sealant to harden in accordance with manufacturer's instructions before allowing traffic access to the area. 3.5.1.6 Final testing. Repeat the test procedure specified in 3.5.1.4. 3.5.1.7 Detector feeder cable installation. The feeder cable and the loop lead -in wire shall be terminated in the pull box and all connections shall be spliced, soldered, compounded and taped. The entire splice shall be encapsulated in a waterproo f splice kit approved by the Engineer. 3.5.1.8 Record keeping. A record of any modifications to the original installation shall be made by the Contractor . The Contractor shall furnish the Engineer with 3 copies of the corrected or as-built plans including initial and final test results.

3.6Service and Meter Box.

3.6.1 When required, the Contractor shall furnish and install a service riser on the pole selected by the power company in conformity with the plans, and shall also furnish the power company its choice of equipment above t he switch or breaker. Wire sizes shall be as specified by either the plans or the power company. In case of discrepan cy, the larger size shall be used. 3.6.2 A NEMA weatherproof disconnect switch and cabinet shall be furnished and installed at the locati on specified. The circuit breakers in this switch shall be 30 A. 3.6.3 The Contractor shall make all arrangements for the service connection and be responsible for all charges incurred thereby. 3.6.4 Under no conditions shall any equipment be installed on any utility pole unless specifically stated on the plans. 3.6.5 The Contractor shall notify the telephone company whenever a service connection is to be made on a jointly owned pole, providing the telephone company with the following information:

3.6.6 In the case of underground services, the Contractor shall furnish and install all equipment as required by the power company, be responsible for all charges incurred thereby, and complete the work to the satisfaction of the power company. Meters shall not be installed in manholes. 3.6.7 The initial power hook -up and operational costs will be paid by the Contractor during the Contract. Once the traffic signals are completed and accepted through the project final inspection process the monthly utility cost will be paid by the responsible party.

3.7Signal Cable and Wire Installation.

3.7.1 The Contractor shall furnish and install sufficient cable and wir e to operate the system properly and at least 4 spare conductors in each cable run shall be provided. 3.7.1.1 Each mast arm assembly shall have a dedicated cable run from the controller cabinet. 3.7.2 No more than one cable shall be permitted in a conduit except to eliminate splices in pull boxes. When more than one cable is permitted, the area of combined cables shall not exceed 30 percent of the inside area of the conduit. 3.7.3 All pedestrian signals and push buttons shall be individually wired from the field to the cabinet terminals. 3.7.4 Messenger cable shall run unspliced between poles and shall be installed with a 5 percent sag in the wire when measured from the point of attachment to the middle of span. The cable shall be attached to the pole eyeb olt by a preformed type grip on one end and an automatic type grip on the opposite end. Messenger cable shall be grounded to the back -guy cable.

New Hampshire Department of Transportation Standard Specifications – 2016

3.8Signal bases, housings, and controllers shall be furnished and installed as required. All structures and housings shall be

plumb after erection. 3.8.1 Multiple housings on a single post shall be grouped together using 1 -1/2” galvanized pipe and 1 -1/2” galvanized rail fittings. All attachments to the posts shall be made by means of adapters conforming to 2.2.2 . The center of all housings shall be in the same horizontal plane.

3.9Miscellaneous electrical equipment. All additional electrical fittings, service conduit, switches, fuses, traffic signal bulbs,

and such other hardware as is necessary to properly and securely install the equipment shall be furnished. All electrical fittings shall be weatherproof.

3.10Wiring and connections. All connections shall be spliced, soldered, compounded, and taped, using the following color

code:

Note: The white wire shall be used for all neutral connections and shall be connected to the service ground. 3.10.1 No street lighting splices will be permitted in the mast-arm shaft Splices for street lighting and lightning arrestors shall be located inside the nearest street light pull box.

3.11Ground connections. All installations and equipment shall be bonded and grounded to the service ground rod in accordance

with the requirements of the electric power company. 3.11.1 Each signal cable run shall be installed with one green plastic covered copper ground wire to which all equipment shall be bonded in accordance with standard practice. Each base and post, cabinet, and any other component that would be considered a part of the signal system shall be bonded to the ground wire. This ground wire shall be connected to the ground rod at the controller cabinet.

3.12Painting. All paint shall conform to Section 708. The following colors of enamel shall be used:

Federal No.

After the signals have been completely installed, two coats of enamel shall be applied to all unpainted or scratched surf aces after the surface has been lightly sanded to remove gloss.

3.13Operating sequences shall be as shown on the plans or ordered.

3.13.1 Operating sequences shall be verified by testing. 3.13.2 In cooperation with the Fire Department, the Contractor shall make trial runs to ascertain proper timing of the fire pre- emption system. The minimum time shall be approved by the Chief of the Fire Department or the Chief’s representative.

3.14Installation of signals and equipment. The signals and equipment shall be installed by competent workmen or the

manufacturer's representative. 3.14.1 Prior to placing the signals in operation, the signal housing shall be hooded with approved non -transparent material or turned to clearly indicate that the signals are not in operation.

New Hampshire Department of Transportation Standard Specifications – 2016 3.14.1.1 Signs mounted on the signals not applicable to construction conditions sh all be covered as specified in 619.3. 3.14.2 All material including poles, foundations, fittings and cable shall be supplied and installed to make a complete operative installation. 3.14.3 Signs installed on signal arms shall be mounted with “ Astro Bracs” at a right angle to the roadway.

3.15Operation. The Contractor shall commence the operation of the signal system only when permitted by the Engineer.

3.15.1 The Contractor shall provide a qualified technician to thoroughly review and confirm that the system is satisfactory and operational as designed. Prior to the final inspection, the Contractor shall have a revi ew with the NHDOT Bureau of Traffic representative and local officials (including Fire Department technician) to review and comment upon the system.

3.16Warranty. Upon completion of the project, the Contractor shall forward to the Commissioner all warranties to the purchaser

that the equipment which has been installed hereunder shall be free from defects in materials, workmanship, and title, and shall be of the kind and quality designated or described in the Contract. The foregoing warranty supersedesal l other warranties whether written, oral, or implied. If it appears within 6 months from the date of Acceptance of the work that the equipment installed hereunder does not meet the warranties specified above, the Contractor shall promptly correct any defect or nonconformance with the specifications. This warranty does not relieve the Contractor of the requirement of 106.04. Method of Measurement

4.1Traffic signals and flashing beacons will be measured as a unit . Where more than one unit is specified in the Contract,

separate item numbers will appear for each separate and complete unit. Basis of Payment

5.1The accepted quantity of traffic signals or flashing beacons will be paid for at the Contract lump sum price complete in place.

5.2When an item of conduit appears in the Contract, conduit for traffic signals will be paid for under Section 614.

5.2.1 When no item for conduit appears in the Contract, any conduit required will be subsidiary.

5.3Materials required under 3.9 shall be subsidiary.

Pay items and units: 616.1__ Traffic Signals Unit

616.15__ Traffic Signals – Fiber Unit

616.2__ Flashing Beacons Unit 616.4__ Relocating Traffic Signals Unit 616.5__ Concrete Bases Unit 616.6__ Relocating Flashing Beacons Unit

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of furnishing qualified uniformed officers, with or without vehicles, or flaggers as required to dire ct

or control traffic through or around the work or as ordered. 1.1.1 The Contractor may perform flagging operations with his own forces or through approved Subcontractors. Subcontractors shall comply fully with 108.01. Flaggers shal l be the primary means for providing dynamic temporary traffic control operations in work zones. 1.1.2 Uniformed officers shall have legal authority to enforce traffic laws on the roadways within the work zone. Uniformed officers may be utilized for their specific authority for operations beyond that of a flagger, such as assistance in speed control and traffic law enforcement, as necessary, and as approved by the Engineer. Equipment

Vehicles for use with uniformed officers shall be official police vehicles with appropriate police markings and blue flashing

lights that are visible from 360° around the vehicle and to oncoming traffic. Given the variability of markings and light arrangements of police vehicles, the final determination of acceptable police vehicles shall be made by the Engineer. Police vehicles with roof mounted lights are preferable when available. Police vehicles used at night shall have dimmable blue flas hing lights appropriate for nighttime operations.

Traffic paddles and flagger equipment shall conform to those described in the MUTCD.

Two-way radios for uniformed officers and flaggers shall be dependable, providing clear communication at all times between

radio operators.

For night operations, the use of lighting at flagger stations is required as stated in the MUTCD.

Construction Requirements

Uniformed Officers. Uniformed officers furnished by the Contractor shall have had formal training in the Safe and Effective

Use of Law Enforcement in Work Zones course or approved equivalent. 3.1.1 Effective April 1, 2013, all Uniformed Officers working on all NHDOT funded, including municipally managed, projects shall have successfully completed a NHDOT approved course on The Safe and Effective Use of Law Enforcement Personnel in Work Zones. This course shall be taken once every four years. Sources of NHDOT approved training can be found on the NHDOT website. 3.1.2 Upon request by the Engineer, the officer shall provide verification of training within 48 hours. 3.1.3 Uniformed officers shall be attired with regulation duty uniforms, headgear, high -visibility apparel in accordance with the MUTCD, and shall wear an exposed badge.

Designated Flagger Trainers. The Contractor or the Subcontractor(s) supplying flaggers shall have an employee(s)

designated to train flag personnel. Designated trainers shall have taken a formal flagging course as described in 3.2.1 at least once every four years. 3.2.1 A flagging course taken by employees designated to train shall consist of a minimu m of 3 hours of training providing the following general information:

and flagger position.