1020.01 Traffic Signal Heads.
1020.01.1 General Requirements: Traffic signal sections, beacon
sections, and pedestrian signal sections shall be of the adjustable type. Materials and construction of each section shall be the same. Signals shall be constructed with 12 -inch lenses in accordance with the plans. Signal sections can be polycarbonate or aluminum. All signal sections, visors and associated brackets shall be black color. Aluminum sections shall be finished both inside and out with a thick, black powder coating or with two (2) coats of high grade black enamel. Each coat shall be independently baked to resist peeling and chipping. Edges shall be deburred and smooth with no sharp edges.
1020.01.2 Housing, Housing Doors, and Visors: Only
Traffic Signal Heads on the Traffic Operations Approved Products List will be accepted.
1020.01.2 1 Optical Unit for Programmable Head: The
optical unit shall include a light emitting diode (LED). The optical unit and visor shall be designed as a unit to eliminate the return of outside sunlight from entering the unit from above the horizontal (known as sun phantom). The optical unit shall be designed and assembled so that no light can escape from one indication to another.
1020.01.2 2 12-Inch LED Traffic Signal Module (Mast Arm
and Span Wire Mount): Only 12-Inch LED Traffic Signal Lamp Units on the Traffic Operations Approved Products List will be accepted.
1020.01.3 Pedestrian Signals: Only LED Countdown Pedestrian
Signal Heads (LED modules and housings) listed on the Traffic Operations Approved Products List will be accepted.
1020.01.4 Brackets: Brackets for the assembly of 2-way, 3-way,
and 4-way signal sections shall have the center of the attachment points arranged on a 8-inch radius. Attachment to signal head shall be made with 1 1/2-inch conduit or 3-bolt type fittings with a bolt length 1 1/2 inches. Fittings at the center of the bracket shall have a removable lower plate for access to the wireway. The bracket at the supported end of the signal section shall be 1 1/2-inch conduit for wiring and a fitting with cover for access to the wire -way. The bracket at the opposite end of the section may be either the same as the top or solid. A set screw engaging a drilled hole shall be provided at each joint on the bracket where conduit type joints are used or an equivalent locking device shall be provided. The attachment point for mounting on the bracket shall be a 2 -inch opening. When slip -fit is used, the section shall come complete with the necessary nuts and washers for 1 1/2-inch conduit. Provisions shall be made for a positive lock to prevent accidental bracket rotation. Locking may be accomplished by means of serrations, detents, set screws, or similar devices. Friction locking will not be acceptable. An acceptable alternative to the 1 1/2-inch conduit will be a tri -stud type fitting with washer. Tri -stud length shall be 1 1/2 inches. Unused openings of signal sections shall be closed with a standard waterproof plug for a 1 1/2-inch opening. The minimum length of the plug shall be 1 1/2 -inches. The exposed portions of plugs shall be painted to match the color of the signal heads. Carbon steel components shall be galvanized in accordance with ASTM A153. Apply paint or powder coat to match the color of the signal heads.
1020.01.5 Signal Mounts: Signal sections and beacon sections
shall be as shown on the plans and shall be suitable for one of the following standard mounts. The type mount for each will be specified in the plans.
1020.01.5 1 Support Cable Mount: Support cable mounted
signals shall come with a disconnect hanger and clamp described in
1020.07 Signs shall be mounted with a Span Wire Sign Bracket
approved on the Traffic Operation Approved Product List.
1020.01.5 2 Pedestal Mount: Pedestal mounts shall be
furnished with a slip fitting for placement on a 4-inch inside diameter pipe pedestal having set screws for correct alignment of the signal. Provisions for the entrance of signal cables shall be incorporated into the design of the bracket assembly. The bracket assembly shall incorporate a weatherproof terminal compartment or box with a removable cover allowing complete access. The box shall be a suitable size to accommodate, and shall come equipped with, a terminal strip with terminals equal to the number of signal indications in the signal heads plus one or more for common and for equipment ground. The terminal compartment shall be neat in appearance and shall be adjacent to or near the pedestal mount. In no case shall feed wires be required to pass through a signal section or face to reach the terminal compartment. A terminal compartment integral with the bracket will be permitted. Apply paint or powder coat to match the color of the signal heads.
1020.01.5 3 Mast Arm Mount: This mount shall be furnished
and installed. Only Signal Head Mast Arm Brackets on the Traffic Operations Approved Products List will be accepted. Signs shall be mounted with a Mast Arm Traffic Sign Mounting Bracket listed on the Traffic Operation Approved Product List.
1020.01.5 4 Side Mount: This mount shall be furnished for
attaching brackets to vertical supports as shown on the plans. The bracket mounting hub shall accept 1 1/2-inch conduit and provide for a wire opening equivalent to a 1 1/2-inch condulet. For timber pole installation, the side mounts shall have a vertical entrance for 1-inch conduit. Apply paint or powder coat to match the color of the signal heads.
1020.01.5 5 Flashing Beacon Signal Mount: The flashing
beacon signal shall attach to the support cable by a bracket as shown on the plans. The bracket shall be provided with a cable entrance adapter with provisions for balancing and securing the signal. Apply paint or powder coat to match the color of the signal heads.
1020.01.6 Backplates: Only backplates listed on the Traffic
Operations Approved Products List will be accepted.
1020.01.7 Disconnect Hanger for Traffic Signal Head: The
hanger shall provide a means for connecting and disconnecting the signal head electrically and mechanically from signal support cable and span wire without use of tools. The hanger, with top and bottom attachments and clamps, shall not increase signal height from the span wire to the bottom of the signal by more than 6 inches. Apply paint or powder coat to match the color of the signal heads. The hanger shall be as shown on the plans and shall conform to the requirements of the clamp, housing and terminal block, plug, and adapter.
1020.01.7 1 Clamp: The clamp shall be capable of attaching to a
1/4-inch to 7/16-inch support cable and shall attach to or be integral with a balance adjusting device and a suitable weatherproof entrance for signal cable. The support cable clamp shall utilize a minimum of two “J” or “U” type bolts 3/8-inch or larger. A 5/8-inch clevis type suspension clamp shall be provided with a 5/8-inch diameter. The balance adjustor shall be suitable for mating with a clevis-type clamp having a horizontal clearance of 5/8 inch and pin of 5/8-inch. All steel shall be galvanized in accordance with ASTM A153.
1020.01.7 2 Housing: Only Traffic Signal Heads on the Traffic
Operations Approved Products List will be accepted. The housing and accessories shall be high-strength aluminum alloy and shall be equipped with a door of similar material. The door shall be held shut by a device operable with one hand without use of tools and shall not be easily removable. The door, when open, shall provide complete access to the interior of the housing and shall include a device to hold the door open while working inside the hanger if it will not remain open. The housing shall be equipped wi th two or more weatherproofed openings for signal cable entrance. The openings shall be equipped with suitable bushings for cable protection. Cable entrances shall be capable of accommodating three signal cables 11/16 -inch in diameter. The housing shall be provided with a permanently mounted clamping device to prevent the cable from twisting. The clamping device shall not damage the cable jacket, insulation, or break wires. The housing shall be provided with a 3 1/2 -inch-by-3 1/2 -inch cast aluminum flange adaptor as shown on the plans for connecting to the signal head or bracket.
1020.01.7 3 Terminal Block and Plug: An easily accessible
pressure type terminal block shall be located in the housing and shall accommodate from twelve or eighteen separate lines, as specified. Each terminal shall be permanently numbered for identification, shall accommodate a minimum of two AWG No. 12 conductors, and shall be sufficiently rugged to permit tightening for proper electrical connection without damaging the wire. The terminal block shall be wired to a multi-circuit female jack connector mounted in the housing and aligned in accordance with the plans. A minimum size No. 18 AWG wire, with 600 -volt polyethylene or polyvinylchloride insulation, shall be used between the terminal strip and the jack connector. The numbered terminals on the terminal strip shall be wired to the corresponding numbered pin in the jack connector. A suitable male plug with clamp for the corresponding female jack connector shall be furnished and shall be equipped with 4 feet of cabled leads for connection to the signal heads. Wire shall be No. 18 AWG, 600 -volt polyethylene or polyvinylchloride insulated and neatly cabled.
1020.02 Traffic Detectors and Associated
EQUIPMENT.
1020.02.1 Loop Detectors: Detector units for signalized
intersections are included as part of DOTD Traffic Control Standard 18A. Detector units required at remote vehicle detection locations shall comply with NEMA TS1, Section 15, with or without delay and extension timing as specified. The two types of inductive detector units are specified are those with and those without the ability to delay and extend a call, NEMA Type 1 and Type 1T. Detector units shall be suitable for accurate detection of vehicles from motorcycles to tractor -trailer combinatio ns which ordinarily travel public streets and highways with sufficient conductive material, suitably located to permit recognition and response by the detector system. Detector units shall also comply with NEMA TS1, Section 15.2.6.
1020.02.1 1 Size and Case: The amplifier case shall be
constructed of rugged metallic material with a protective coating. A hand- tool-removable cover shall be provided to allow access to internal circuitry.
1020.02.1 2 Connectors, Switches, and Fuses: Switches,
connectors, and fuses shall be located on the front of the unit.
1.Permanently label each switch to identify its function. Permanently label each position to identify its mode of operation. Each mode of operation shall be simple to program with one switch position assigned to each function.
2.Provide a single connector on the front of the unit to comply with NEMA TS1, Section 15.2.28.1. This connector shall mate with cable connections MS 3106A-18-1S.
3.Plug wiring shall be as follows. PIN1 FUNCTION Pin A AC (-) Pin B Relay Common Pin C AC (+) Pins D & E Loop Leads Pin F Relay (N.O.) Pin G Relay (N.C.) Pin H Chassis Ground Pin I Spare Pin J Delay Override 1No pins shall be used for any other purpose than those listed above.
4.Permanently label fuse holders to identify the size of the fuse.
1020.02.1 3 Electrical Characteristics
1.Detector unit outputs shall be a relay type as referenced in NEMA TS1, Section 15.2.29.1. The output operation shall be indicated by a high intensity light emitting diode.
2.Color coding for the wire shall be as follows: Function Color Code Detector Wiring Not Specified AC(+) Black AC(-) White Relay Common White/Black Stripe Ground Green
3.The operation of the detector unit shall comply with NEMA TS1, Section 15.2.1. In addition, the detector unit shall retune to a new inductance value following an excessively large inductance change.
4.When sensor loop and loop lead -in network falls outside the specifications in NEMA TS1, Section 15.2.13, the detector shall generate a failsafe conti nuous output in both presence and pulse modes. The continuous output shall remain until the memory is cleared by removing power or resetting.
5.When specified, the detector unit shall have the ability to delay and extend a call to the controller. The Delay/Extension operations shall comply with NEMA TS1, Section 15.2.24. The delay time shall begin when a vehicle enters the detection area until the call relay is closed representing activation and shall be selectable in the range between 0 and 30 seconds. The extension time shall begin timing when the vehicle leaves the detection area, continuing the activation for the selected time. The time shall be selectable in the range of 0 to 7 1/2 seconds.
6.The detector unit shall have at least three selectable frequencies which shall be visible at all times on the front of the detector unit.
7.The Sensitivity Control shall comply with NEMA TS1, Section 15.2.14 and Section 15.2.15. There shall be at least three selectable sensitivity ranges located on the front of the detector unit. The sensitivities shall be nominally 0.02 percent, 0.08 percent, and 0.32 percent change in total loop inductance.
8.The modes of operation shall comply with NEMA TS1, Section 15.2.17. There shall be two presence modes and one pulse mode. The selected mode shall be indicated at all times on the front of the detector unit. Long presence mode shall continue to detect the same vehicle within the detection area for at least 3 1/2 minutes for a Class 1 type test vehicle. Medium presence mode shall continue to detect the same vehicle within the detection area for at least 20 seconds for a Class 1 type test vehicle.
1020.02.1 4 Fail Safe: The detector shall operate with the sensor
loop shorted to ground or of poor quality. The unit shall generate a continuous call when returning failed sensor loop, failed detector unit, or power failure.
1020.02.1 5 Loop Detector Sealants: Comply with Table
1020-1: Table 1020-1 Loop Detector Sealants Hot Applied Cold Applied Single Component Two Component Rapid Set Slow Set Physical Property Test Method Self Leveling Non- Sag Self Leveling Non- Sag Self Leveling Non- Sag Total Solids by weight,%, Min. ASTM D2834 60 60 60 60 60 60 Tack Free Time, hr, Max. ASTM C679 4 4 2 2 4 4 Rheological Properties ASTM C639 Type 1 Smooth surface Smooth surface Smooth surface Slump, mm ASTM D2202 7.6 7.6 7.6 Extrusion Rate, mL/min, Min. ASTM C1183 50 50 Hardness shore A, Min. ASTM D2240 10 10 10 10 10 10 Penetration @ 25°C, Min. ASTM D5 60 Softening Point, °C, Min. ASTM D36 82 Asphalt Compatibility1 ASTM D5329 pass pass pass pass pass pass pass Pot Life, minutes, Min. ASTM C881 12 12 30 30 Dielectric Strength, 60 Hz, Short Time test, Electrode 1 in air @ 25°C kV/mm, Min. ASTM D149 13.8 13.8 13.8 13.8 13.8 13.8 13.8 Flex @-7°C, inch, 90° Bend ASTM D5329 pass pass pass pass pass pass pass 1Not applicable when used to seal portland cement concrete pavement
1020.02.2 Video Detection System: A Video Detection System
(VDS) monitors vehicles on a roadway via processing of video images and provides detector outputs to a traffic controller or similar device.
1020.02.2 1 System Function Requirement: The system
shall provide flexible detection zone placement anywhere within the combined field of view of the image sensors. Presence detector configurations shall be lines or boxes placed across lanes of traffic or lines placed in-line with lanes of traffic. A single detector shall be able to replace one or more conventional detector loops. Detection zones shall be able to be fully overlapped. In addition, detection zones shall have the capability of implementing "AND" and "OR" logical functions including presence, extension and delay timing. These logical functions may be excluded if provisions are made to bring each detector separately into the controller and the controller can provide these functions. The system shall produce accurate detector outputs under all roadway lighting conditions, regardless of time of day. The system shall be capabl e of providing 64 or more detector outputs from up to 8 camera/video processor units. The VDS processor system should provide compressed color video through the DB -9 RS -232 data stream with active detection zones overlaid. The system shall have a modular electrical design. It shall be powered by 89-135 VAC, 60 Hz single -phase. Power to the system shall be from the transient protected side of the AC power distribution system in the traffic control cabinet in which the system is installed. If the VDS process or is located in the controller cabinet, then, the system shall be powered by 12-24 VDC and draw less than 2 amperes. The system software shall be able to detect either approaching or departing vehicles in multiple traffic lanes. Each zone and output shall be user-definable through interactive graphics by placing lines and/or boxes in an image on a video monitor or personal computer. The user shall be able to redefine previously defined detection zones. Detection zones shall be provided that are sensitive to the direction of vehicle travel. The direction to be detected by each detection zone shall be user programmable. The Windows software shall be able to display the traffic parameters on the video monitor per vehicle for each detection zone by lane. It sha ll be possible to view and sort the stored data for selected time intervals. When the monitoring equipment is directly connected to the VDS processor unit, it shall be possible to view vehicle detections in real-time. The field communications wiring betwe en each camera and the traffic controller cabinet shall meet VDS factory requirements.
1020.02.2 2 VDS Processor: The processor is an electronic unit
that converts the video image provided by the cameras, generates vehicle detection for defined zones and collects vehicular data as specified. The VDS processor may be housed in either the cabinet or camera housing. The processor shall fit directly into NEMA TS1 and TS2 type detector racks or equipment manufacture supplied racks. The video output from the unit shall b e in color with active detection zones overlaid on full motion video. The processor unit shall be capable of providing the following detection zones: count, presence, directional presence, speed, stopped vehicles, and queue types of detection zones. The processor unit shall meet the following requirements:
1.Each video processor module card shall be capable of a minimum of 64 detector outputs and each processor input shall be capable of a minimum of 20 detection zones.
2.The processor unit shall meet the environmental requirements set forth by the latest NEMA (National Electrical Manufacturers Association) TS1 and TS2 standards. Operating temperature shall be from -25°F to +160°F at zero to 95 percent relative humidity, non-condensing.
3.Detection input shall be via a SDLC interface connection to the signal controller front panel.
4.The processor unit software and/or the supervisor software shall include diagnostic to allow testing of the system functions. It shall include the capability to set, clear individual detector outputs, and display the status of inputs to setup and troubleshoot in the field.
5.The processor shall provide real -time vehicle detection within 112 milliseconds (ms) of vehicle arrival. It shall be capable of simultaneously processing information from various video sources, including CCTV video image sensors and video tape players. The video sources may be, but are not required to be, synchronized or line-locked.
6.The processor shall compensate for minor camera movement up to 2 percent of the field of view at 400 ft. without falsely detecting vehicles. The camera movement shall be measured on the unprocessed video input to the processor unit. The camera shall operate while directly connected to the processor unit. Once the detector configuration has be en downloaded or saved, the video detection system shall operate with the monitoring equipment (monitor and/or laptop) disconnected or on-line.
1020.02.2 3 BIU (Bus Interface Unit): The VDS system shall
incorporate one BIU to accomplish controller interface connection. This BIU shall be capable of a minimum of 64 outputs with the BIU assignment being hardware selectable.
1020.02.2 4 Video Detection Camera: The video detection
camera shall be compatible with the video detection processor and shall be certified by the manufacturer to ensure proper system operation. The camera shall produce a useable video image in 0.009 to 930 foot - candles luminance. Images shall be produced with a Charge Coupled Device (CCD) sensing element with horizontal resolution of at least 470 lines and vertical resolution of at least 400 lines. Images shall be output as a video signal conforming to RS 170A or CCIR. The camera shall include mechanisms to compensate for changing of lighting by using an electronic shutter and/or auto-iris lens. The camera shall include a motorized variable focal length lens with factory preset focus that requires no field adjustment. Zooming of the camera lens is required to suit the site geometry by means of a portable interface device designed for that purpose and manufactured by the detection system supplier or via software and standard laptop. When operating in the environmental enclosure with power and video signal cables connected, the image sensor shall meet FCC class B requirements for electromagnetic interference emissions. The video output of the cameras shall be isolated from earth ground. All video connections for the cameras to the video interface panel shall also be isolated from earth ground. Connections for both video and power shall be made to the processor using waterproof, quick disconnect connectors.
1020.02.2 5 Camera Enclosure: The camera and lens assembly
shall be housed in an environmental enclosure that meets or exceeds NEMA-4X and provides the following capabilities:
1.Be metallic and waterproof and dust -tight to the latest NEMA -4X specifications.
2.Allow the camera to operate satisfactorily over an ambient temperature range from -25°F to +160°F while exposed to precipitation as well as direct sunlight.
3.Allow the camera horizon to be rotated in the field during installation.
4.Include a provision at the rear of the enclosure for connection of power and video signal cables. The input power to the environmental enclosure shall be nominally 120 or 240 VAC 50/60 Hz and the power consumption shall be 35 watts or less under all conditions.
5.A thermostatically controlled heater shall be at the front of the enclosure to prevent the formation of ice and condensation, as well as to assure proper operation of the lens's iris mechanism. The heater shall not interfere with the operation of the camera electronics, and it shall not cause interference with the video signal.
6.The enclosure shall be light-colored and shall include a sun shield to minimize solar heating. The front edge of the sunshield shall protrude beyond the front edge of the environmental enclosure and shall include provision to divert water flow to the sides of the sunshield. The amount of overhang of the sun shield shall be adjustable to block the view of the horizon to prevent direct sunlight from entering the lens. Any plastics used in the enclosure shall include ultra violet inhibitors.
7.The total weight of the image sensor in the environmental enclosure with sunshield shall be less than 20 lbs.
8.Camera mounting hardware shall allow for vertical or horizontal mounting to the camera enclosure.
1020.02.2 6 Maintenance and Support: Maintenance and
support is required from the manufacturer for 10 years. The equipment manufacturer shall maintain an adequate inventory of parts to support maintenance and repair of the video detection system. These parts shall be available for delivery within 48 hours of placement of an order. The equipment manufacturer shall maintain an ongoing program of technical support for the video detection system. The equipment manufacturer shall provide on -site technical support and support on any special circuitry that may be required in certain applications. The equipment manufacturer shall be on call 24/7 and be present at any designated state signal location within 12 hours of notification. The contact information shall be provided to the State Traffic Signal Engineer at Traffic Services and continually updated.
1020.02.2 7 Warranty: All material and workmanship shall be
covered by supplier(s’)/manufacturer(s’) guarantee and/or warranty for a period of a minimum of 2 years or longer, if offered by the manufacturer. Warranty period shall begin the day the video detection system is activated, either as new order or warranty repair. The equipment manufacturer shall bear all expenses connected with return of any equipment which the Department deems necessary to return for adjustments during warranty period. Equipment manufacturer(s) shall make all engineering data, diagrams, and software changes or improvements available to the Department at no additional cost.
1020.02.3 Pedestrian Pushbuttons:
1020.02.3 1 Housing: The pedestrian push button housing shall
be weather-tight and tamper-proof. Housing shall be designed to prevent an electrical shock. It shall have provisions for grounding in accordance with the National Electrical Code (NEC). Pedestrian push button housing shall be cast from aluminum alloy, smooth, and free of blemishes. The manufacturer’s name or trademark shall be located on the housing. Both housing and cover shall have an anodized conversion coating to provide a proper bas e for paint adhesion. The assembly shall match the signal head’s color. Apply paint or powder coat to match the color of the signal heads. All bolts, nuts, washer, lock washers, screws, and other assembly hardware shall be galvanized steel, stainless ste el, or dichromate sealed aluminum. When dissimilar metals are used, the metals shall be so selected or insulated to prevent corrosion. The bottom provisions of the housing shall be tapped for and provided with a 1/2 -inch National Pipe Tapered (NPT) thread ed conduit plug. The back of the push button housing shall be provided with a hole capable of being threaded for a 1/2 - inch NPT threaded conduit plug and capped with a non-threaded 1/2- inch plastic plug. The back mounting provisions of the housing shall be designed to accommodate pole diameters from 3 inches to 14 inches.
1020.02.3 2 Push Button: The push button switch shall be
actuated by a plunger with a minimum 2-inch convex diameter. The assembly shall be designed so that the maximum plunger travel does not exceed the switch travel. A spring shall be installed between the plunger and switch. The spring shall provide an operating force of less than 5 lbs. A protective shroud shall encircle the plunger to deter vandalism. The shroud shall be cast as an integral part of the cover. There shall be a moisture barrier between the plunger and the switch. The assembly shall conform to all minimum requirements set forth with the American with Disabilities Act.
1020.02.3 3 Wiring and Electrical Requirements: The switch
shall have terminal connection points on back to allow for an electrical spade connection to the back of the switch allowing user to connect twisted pair directly to the back of the switch. Wire and wire nut connections from the back of the switch shall not be acceptable. The switch assembly shall be capable of operating in temperature ranges of 20 ºF through 120 ºF. The switch assembly shall be electrically rated to carry 25 amps at 125 volts AC, 250 volts maximum. The switch assembly must have the following recognized certifications and/or approval: UL, CSSA, Mil Spec # MIL-S-8805. 1 0 2 0 . 0 2 . 4 Wireless Magnetometer Vehicle Detection System: Only Wireless Magnetometer Vehicle Detection Systems on the Traffic Operations Approved Products List will be accepted.
1020.03 Traffic Signal Hardware and Equipment.
1020.03.1 General: This subsection defines the general
requirements that apply to all hardware and equipment not specifically listed. When design tests are specified, provide documentation indicating that such tests have been satisfactorily completed.
1020.03.2 Miscellaneous Hardware: Screws, nuts, and lock
washers shall be stainless steel or galvanized in accordance with Section 811. Do not use self-tapping screws unless approved.
1020.03.3 Pedestal Anchor Bolts: Furnish steel anchor bolts as
shown on the plans and fit with one hex nut and one washer. Nuts, washers, and anchor bolts shall be galvanized in accordance with ASTM A153.
1020.03.4 Support Cable (Span): Support cable for interconnect
and detector support cable shall be 1/4-inch outside diameter and signal support cable and guy wire shall be 3/8-inch outside diameter and shall comply with ASTM A475, 7-strand Siemens-Martin grade with Class A coating.
1020.03.5 Guy Components: Guying components and hardware
shall be galvanized in accordance with ASTM A123 and ASTM A153. Guy clamps shall be steel, 3-bolt type, 6 inches in length, and of proper strand size to fit both sizes of cable. Clamp bolts shall have an upset shoulder fitting into the clamp plate.
1020.03.6 Traffic Signal Conductors: Furnish 600 volt insulated
THHN/THWN or XHHW cable. Filler material, when used, shall be non-metallic, moisture resistant, non-hydroscopic, non-wicking, and non-absorbent. The conductors that are to be marked with tracer in addition to the solid color shall have the tracer as part of the insulation. Ink marking is not acceptable. The outside jacket shall be smooth and shall not display patterns of the conductor lay on the outside of the jacket. The traffic signal cable shall be No. 14 AWG stranded conductor. A ll material, color code, and testing shall comply with IMSA 20 -1. The interconnecting cable between intersections for closed loop and telemetry operation shall be 6 pair No 19 AWG, IMSA 20-2. Loop lead -in conductor shall be tinned copper No. 14 AWG strand ed conductor, twisted pair with an overall shield. The cable shall comply with IMSA 50-2. Loop detector wire shall comply with IMSA 51-7 and shall be 19 strand insulated by a cross linked polyethylene compound. The insulated conductor shall be completely incased in a tube of low density polyethylene compound.
1020.03.7 Underground Electrical Junction Box: Only pull
boxes on the Traffic Operations Approved Products List will be accepted.
1020.03.8 LED Blank-Out Signs:
1020.03.8 1 General: Blank-Out Signs shall have “on” or “off”
functions and shall operate on 120 VAC power. Blank-Out Signs legend shall be in compliance with the current FHWA/MUTCD specification. The symbols shall be clearly legible under all lighting conditions. Also, the sign shall be capable of continuous operation over a range in temperatures from -15ºF to +140ºF.
1020.03.8 2 Enclosure: Each enclosure shall be a minimum of
NEMA 3R construction, self-supporting, aluminum. Enclosure shall come with complete mounting hardware to be suspended from a 3/8 inch span wire, or a mast arm as shown on the plans. Enclosure shall use a neoprene strip to provide a watertight seal between the door and the display lens; it also shall have one or more stainless steel link locks to tightly secure the door to the gasket. Mount the LED assembly on the face of the Blank -Out Sign. The sign shall have a visor to protect the sign’s face from direct sunlight. Blank-Out Signs’ components shall be readily accessible. Provide drain holes that prevent in sect entrance to the enclosure and an adequate means for condensation to drain from the enclosure. All corners or seams shall be heli- arc welded to provide a weatherproof seal around the entire case. Maximum weight of enclosure including all components sha ll be 35 pounds. The finish for the enclosure body shall be powder coated satin black. The message board mask shall be finished in a flat black powder coat. The inside surface of the glare shield shall be powder coated flat black and the outside surface of the glare shield shall be powder coated the color of the enclosure body.
1020.03.8 3 LED Modules: LED assembly shall be mounted to a
flat black aluminum panel. Diming shall be a standard feature on the Blank-Out Signs. Incorporate a dimmer failsafe feature whereby the light engine will continue operating at its full intensity in the event of a dimmer relay or sensor failure.
1020.03.8 4 Electrical: Electrical requirements shall comply with
ITE VTCSH, July 1, 2007 Edition, Light Emitting Diode (LED) Vehicle Arrow Traffic Signal Supplement, Sections 5.2 thru 5.8.
1020.03.9 Flashing Switch Assembly for Beacons:
1020.03.9 1 General: The flashing switch assembly shall include
a preassembled: enclosure, required hubs and gaskets, back panel, Cinch Jones socket, solid state flasher, and terminal block with provision for terminating all field and local wiring. , The assembly specified herein shall be designed to operate on 110-130 volt, 60 cycle, alternating current, and shall be completely wired and enclosed in a weatherproof cabinet. The flasher shall meet NEMA standards for a two-circuit flasher rated at 15 amps per circuit (Type 3). For the purpose of these specifications, the term “solid state” is defined as: the main current to the signal load that is not switched by electro - mechanically operated contacts. The flasher shall be certified by an independent laboratory as conforming to NEMA TS -1, Section 8, and Section 2.2.3.2. This certificate shall be included with the drawing and literature for this equipment.
1020.03.9 2 Cabinet: Furnish the switch in a weatherproof
aluminum cabinet with minimum interior dimensions of 9-3/4 inches wide, 12 inches long and 5-1/2 inches deep. Provide a standard lock with one key to the door “Traffic Control” or “Traffic Signals” shall be cast or embossed into the metal with letters 3/4 inches high or larger on the door. All cabinets shall be suitable for wood or steel pole mounting. Cabinet shall have two 2 -inch wire entrance holes, one in the top and one in the bottom. The wire entrance holes shall be located on the back edge of the cabinet and centered on the width of the cabinet. The hubs to the cabinet shall align on the center of the entrance hole. Lock washers and hex nuts for the bolts shall be used to attach to the hub. The bolt pattern for the hub is 2- 1/8 inch centered on a line perpendicular to the outside back of the cabinet and 3-3/4 inch parallel to the back of the cabinet. Mounting holes for the bolts shall be 3/8 inch. The centers of the bolt pattern on the hub and the wire entrance hole shall coinc ide. The location of the hubs shall allow minimum clearance for box end wrenches to fit onto the nuts within the cabinet. Apply paint or powder coat to match the color of the signal heads. The interior shall be furnished with gloss white enamel by the manufacturer.
1020.03.9 3 Hub, Conduit: Hubs for the cabinet shall be cast
aluminum, ASTM B108. All threaded hubs shall have a threaded collar a minimum of 2 inches from the base of the hub. The manufacturer shall make all hubs with stainless steel bolts casted into the hub. The manufacturer shall design the hub with the outside smooth to shed water. Table 1020-2 Cabinet Hub Description TYPE OPENING(S) SIZE, Inches OPENING DESCRIPTION Inches blank - 0 - no opening, flat plate, ¼ minimum thickness single 3/4 one (1) opening, 3/4 conduit thread single 1 one (1) opening, 1 conduit thread single 1-1/2 one (1) opening, 1-1/2 conduit thread single 2 one (1) opening, 2 conduit thread single 2-1/2 one (1) opening, 2-1/2 conduit thread single 3 one (1) opening, 3 conduit thread Double 3/4 two (2) openings, each 3/4 conduit thread Double 1 two (2) openings, each 1 conduit thread
1020.03.9 4 Back Panel Characteristics: The panel shall
have mounted on it a cartridge type fuse, connector for NEMA Type 3 flasher, flasher support bracket, and permanently identified field terminals. The back panel size shall be 9 inches wide and 12 inches high. The back panel constructed of 1/4 inch electrical grade masonite. The panel shall have four (4) mounting holes approximately 11/32 inches in diameter. The holes shall be centered on an 8-inch x 9-inch bolt pattern. The bolt pattern shall be centered on the back panel. The back panel shall support the NEMA flasher from the panel along its longest dimension. The support shall not restrict removal or installation of the flasher unit on the back panel while the panel is in the cabinet. All wiring shall be on the front of the panel. The field terminals shall be wired to the field side of the terminal block.
1020.03.9 5 Electrical Characteristics: Flashers shall have the
following electrical characteristics:
1.The rating of the output circuit shall be the minimum rating for a tungsten lamp or gas-tuning-transformer load over a voltage range of 60 to 135 volts at 60 hertz. The output circuit shall not be de -rated for the operation over the ambient range of -30 ºF to 165 °F and the humidity range as both detailed in NEMA TS 2 standards.
2.Input to the solid-state flashers shall consist solely of the 60 -hertz alternating-current power source. This input shall supply the power for the output circuit and also provide power to the flasher logic. The flasher shall turn on within 5 degrees of the zero volta ge point of the alternating current line sinusoid and shall turn off within 5 degrees of the zero current point of the alternating-current line sinusoid. The flasher need not turn on within 5 degrees of the zero point of the alternating-current sinusoid for the first flash cycle (on-off cycle) after the initial application of alternating-current power to the flasher.
3.The “flashing” voltage output shall provide not less than 50, nor more than 60, flashes per minute with an on period of 50 + 5%.
4.The flasher output shall have a dv/dt rating of 100 volts per microsecond at 70 °F.
5.The flasher output shall have a peak standoff voltage of 480 volts or greater at 70 °F.
6.The output current from the flasher through the load, when the flasher is in the off state, shall not exceed a maximum of 15 milliamperes rms.
7.The flashing output shall consist of 2 outputs each rated at 15 amperes.
8.Flashers shall be so designed that circuit #1 will be essentially ON when circuit #2 is OFF, and vice-versa. The principal purpose served by this arrangement is to smooth out the loading on the power source. The maximum OFF period when both circuit #1 and circuit #2 are OFF, or the maximum ON period when both circuit #1 and circuit #2 are ON, shall not exceed 17 milliseconds during the transition from OFF to ON to OFF.
9.The line power shall be fused with NON 0 -30 amp fuse. This fuse shall be sized properly for the load limit of the flasher. The wiring shall be properly sized for the design current of each circuit. Separate terminals for the line and field neutral shall be provided.
10.Lightning protection shall be provided for line input and each signal circuit. A gas filled fuse shall be across the line input on the load side of the fuse. It shall be capable of clamping input voltage at 3 50 volts. A Metal Oxide Varistor (MOV) shall be on each signal circuit and provide a minimum clamping voltage of 395 volts and dissipate 30 joules of energy (GE - V150LA10A or approved equal).
11.All electrical connectors shall be insulated from the back pan el at a 600 VAC rating.
12.Use a Cinch-Jones socket type S-406-SB or equivalent.
13.All printed circuit boards shall be made from NEMA (FR -4) glass- epoxy, or equivalent (See NEMA Standards Publication No. LI 1 -1971). Circuit boards exceeding 2 inches in any dim ension shall have a nominal thickness of at least 1/32 inches.
14.All PC boards shall be coated with an epoxy or approved equal type material to prevent erratic performance due to high humidity, condensation, and growth of fungus and mildew. This coating wil l not cover the components on the board, but once the components are in place, the soldered joints shall be covered with a moisture and fungus proof, clear type of acrylic lacquer. This coating shall not be injurious to the board or components and shall n ot interfere with the repair of the circuitry or replacement of components. The walls of all plated through holes shall have a minimum copper plating thickness of 0.001 inches. All circuit tracks shall have conductivity equivalent to at least 2 ounces per square foot of copper (2 oz/ft² Cu).
15.All electrical mating surfaces shall be made of non-corrosive material. The unit shall be designed so that each component is identified by a circuit reference symbol. This identification may be affixed to the printed circuit boards, the cover of the unit, or in an assembly drawing provided with the unit.
1020.04 Poles for Traffic Signal Systems.
1020.04.1 Pedestal Signal Poles: The pole shall be in accordance
with the plans. The base of the pedestal pole shall be cast iron or aluminum and shall be at least 16 inches wide at the bottom, at least 16 inches high and shall be octagonal. The upper end of the base shall be threaded to receive a 4 -inch diameter pipe shaft. The base shall be designed so that it may be fastened to the f oundation using 5/8 -inch-by-16-inch anchor bolts located 90 degrees apart on the circumference of a circle 12-3/4 inches in diameter. The base shall contain a removable door to allow access to anchor bolts and to permit cable splicing. This door shall be fastened to the base using a hex head stainless steel screw into a threaded hole in the base. The shaft shall be 4 inches in inside diameter welded steel tubing with a minimum 1/8 -inch wall thickness. The lower end of the shaft shall be welded to a 6-inch nipple to screw into the base. This shaft shall be a single piece of tubing. Apply paint or powder coat to match the color of the signal heads.
1020.04.2 Steel Signal Strain Pole:
1020.04.2 1 General: Poles and fittings shall be in accordance
with the plans and shall be galvanized in accordance with Section 811. Poles shall be suitable for a minimum horizontal load of 4,000 pounds applied 1 foot below the top of pole.
1020.04.2 2 Pole Shaft: The pole shaft shall have a minimum
base diameter of 11 inches and a maximum base diameter of 11 3/4 inches. The pole shaft shall be tapered to 7 1/2 inch minimum to 8 1/2 inch maximum diameter at the top. The pole shaft may have a round or octagonal cross section. A removable cap shall be used to cover the top of the pole shaft. The pole shall be designed so that its maximum deflection is as shown in Table 1020-3. Table 1020-3 Steel Pole Deflection Pole Length, ft Maximum Deflection, in/100 lb 26 0.25 28 0.30 30 0.38 The pole base shall be designed to fit a 16 inches diameter bolt pattern utilizing four 1-3/4 inches 5NC threaded anchor bolts. The base shall have the manufacturer’s name and pole height stenciled on it and shall be readable from the outside of the pole. The stencil shall be legible after galvanizing.
1020.04.2 3 Hand Holes and Bosses: A hand hole shall be
provided approximately 18 inches above the base with approximate dimensions of 4 inches by 6 1/2 inches and cover shall be provided. The cover shall be restrained to the pole with a 15 inch No. 35 stainless steel chain fastened to the cover and to the inside of the hand hole so that the chain will be inside the pole after the cover is installed on the pole. There shall be no sharp edges on the cover, in the hand hole, or in the pole. The cover shall have the manufacturer's name and the pole height stenciled on it, readable from the outside of the pole. The stencil shall be legible after galvanizing. The hand hole strain bar shall be formed to provide a mechanical lock against the hand hole to prevent turning. No obstructions shall be in the hand hole with the cover removed. A Underwriters Laboratories (U.L.) approved grounding lug shall be provided with each pole. Ground lug shall accept a #6 AWG solid bare copper ground wire. All poles shall have one 1 -inch and one 3 -inch boss centered on a horizontal line 18 inches from the base and one 1-inch and two 3-inch bosses 18 inches from the top. When facing the bosses, the 1-inch boss shall be 35 degrees ±3 degrees to the right of the 3-inch boss. The 3-inch boss shall be located 180 degrees from the hand hole. The bosses at the top of the pole shall be in line with the bosses at the bottom. The poles shall be shipped with all bosses plugged using galvanized steel conduit plugs installed to full thread depth. On octagonal poles the 3 -inch boss shall be centered on one face that is parallel to one edge of the base plate.
1020.04.2 4 Pole Hardware: Furnish anchor bolts in accordance
with the standard details. Anchor bolts shall be 1 3/4 inch, 5 NC thread with a yield strength of 105,000 psi and be hot dipped galvanized for the top 12 inches and comply with ASTM A193-B7. Furnish one additional anchor bolt for acceptance testing by the Department.
1020.04.3 Steel Signal Mast Arm Poles:
1020.04.3 1 50 Feet Single, 45 Feet x 40 Feet Dual and
Less: All mast arms 50 feet single, 45 feet x 40 feet dual and less shall be required to conform to AASHTO 1994. All mast arm designs will be approved by State Traffic Signal Engineer. Mast arms and fittings shall be galvanized in accordance with Section 811. The height of poles, shaft dimensions, and wall thickness shall meet the design requirements and mounting height of traffic signals set forth in the project specifications and in the plans. The length of arms shall be as shown on the plans. Standards shall consist of straight or uniformly tapered shafts, cylindrical or octagonal in cross section, having a base welded to the lower end with anchor bolts. Castings shall be clean and smooth with details well defined and true to pattern. Mechanical control shall prevent the arm from twisting on the shaft. Friction is not acceptable. Mast arms shall be compatible with poles in materials, strength, shape, and size. Mast arms shall slip fit on the shaft.
1020.04.3 1.1 Hand Holes and Bosses: A hand hole shall
be provided for access to the wireway at the union of the arm and the pole shaft. Bosses shall be 1 1/2 FPT in the mast arm and set at 45 degrees from horizontal (downward rotation at the center of the boss, 0 degrees toward the arm top). Bosses shall be located a horizontal distance of 10 feet apart, the first located 16 inches from the top of the arm. The number of bosses required is listed in Table 1020-4. Table 1020-4 Steel Signal Support Standards Shaft Shaft Base Plate Arm Length, ft Number of Bosses Diameter, Inches, Max. Bolt Circle, Inches, Max. 15 -20 2 10 14 1/2 25-30 3 12 15 35-50 4 13 16
1020.04.3 1.2 Hanger Plate:
A hanger plate and horizontal boss shall be at the tip of the arm. The arm shall have an up-sweep design. Design load on the arm shall be sufficient to place a signal head at each boss.
1020.04.3 1.3 Design Requirements: For establishing the
loads, applied to each structure, the weights and projected areas of Table 1020-5 shall be used for traffic signal heads. Table 1020-5 Steel Signal Support Standards Design Requirements Projected Area Per Signal Type1 Design Weight Per Signal, pounds1 Less Backplates, square feet Backplates, square feet 1-Way, 3 Section 1-Way, 4 Section 2-Way, 3 + 3 Sections 3-Way, 3+3+3 Sections 4-Way, 3+3+3+3 Sections 4.8 6.6 8.7 13.35 13.2 8.9 11.2 12.2 15.6 15.6 1When signal heads of a type different from that shown above are used, the weights and projected area shown above shall be increased for the equipment proposed for use. Adjusted values shall be based on the use of 12 -inch diameter lenses and backplates (when used) extending 5 inches beyond signal enclosure.
1020.04.3 1.4 Standard Shaft: The standard shaft base shall
have a minimum diameter of 11 inches. Mast arm standards shall be provided with a transformer type base. Each pole shall be bolted to transformer base with four hex head bolts with two washers and one nut for each bolt.
1020.04.3 1.5 Transformer Base: The transformer base
shall be approximately 20 inches high. The top of the transformer base shall have four 1 1/2-inches-by-2 1/2-inches slots for bolting the pole to the transformer base. The 2 1/2-inches dimension of the slot shall be centered on and perpendicular to a 13 1/2-inches bolt circle. A removal panel on the side of the transformer base shall be provided for access to the base. A 1/2 -inch -13NC grounding nut shall be provided 90 degrees left of this panel. A U.L. approved grounding lug shall be provided with each pole. Ground lug shall accept a #6 AWG solid bare copper ground wire. The bottom of the transform er base shall fit a 16 -inches bolt circle using four 1 3/4 -inches bolts supplied with each pole. These bolts shall conform to these specifications and plan details with exception that the cap nuts shall be replaced with the regular hex nuts. The transformer base shall be capable of being rotated 360 degrees.
1020.04.3 1.6 Wireways: The pole shaft and mast arm shall
be suitable for wire ways throughout their length.
1020.04.3 1.7 Identification: The pole shaft, mast arm and
arms, and transformer base shall have a matching serial number.
1020.04.3 2 55 Feet Single, 50 Feet x 35 Feet Dual and
Greater: Only Bolt-On Mast Arms & Dual Mast Arm Poles on the Traffic Operations Approved Products List will be accepted. The design shall meet the requirements of the 2009 edition AASHTO Standard Specification for Structural Supports for Highway Signs, Luminaries, and Traffic Signals. All mast arm designs will be approved by the State Traffic Signal Engineer. Mast arm assemblies, anchor bolts and hardware shall be hot dipped galvanized in accordance with Section 811 and all materials shall conform to the applicable provisions of Section 1013.
1020.04.4 Anchor Bolts for Steel Signal Support Poles and
Standards For all strain poles and 55 feet or less mast arm, furnish anchor bolts in accordance with the standard details. Anchor bolts shall be 1 3/4 inches, 5 NC thread with a yield strength of 105 ksi, be hot dipped galvanized for the top 12 inches, and comply with ASTM F1554 Grade 105. Furnish one additional anchor bolt for acceptance testing by the Department. For 55 feet single, 50 feet x 35 feet dual and greater mast arms, furnish anchor bolts in accordance with the standard details. Anchor bolts shall be 2-1/4 inch, with a yield strength of 55 ksi, shall be hot dipped galvanized for the top 12 inches, and shall comply with ASTM F1554 Grade 55. Furnish one additional anchor bolt for acceptance testing by the Department.
1020.04.5 Treated Timber Poles: Comply with Section 1014.
1020.05 TRAFFIC SIGNAL CABINET Only TS-2 Traffic Signal
Cabinets on the Traffic Operations Approved Products List will be accepted.
1020.06 SOLAR POWERED FLASHING BEACONS Only Solar
Powered Flashing Beacons on the Traffic Operations Approved Products List will be accepted.
Referenced in this section
Sections that cite this one
Traffic Signals in other states
Get an email when 1020 changes
Louisiana revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Standard Specifications for Roads and Bridges, 2016 Edition. Pages 1121–1145 of 1,145. View official source ↗