732  TRAFFIC SIGNAL MATERIAL

732.01  Vehicular Signal Heads, Conventional
732.02  Vehicular Signal Heads, Optically Programmed, 12-inch (300) Lens
732.03  Vehicular Signal Heads, Optically Programmed, 8-inch (200) Lens
732.04  Signal Lamps
732.05  Pedestrian Signal Heads
732.06  Pedestrian Pushbuttons
732.07  Loop Detector units
732.08  Loop Detector units, Delay and Extension Type
732.09  Magnetometer Detector units
732.10  Magnetometer Sensor Probes
732.11  Signal Supports
732.12  Strain Poles
732.13  Wood Poles
732.14  Down Guy Assemblies
732.15  Pedestals
732.16  Conduit Risers
732.17  Cable Support Assemblies
732.18  Messenger Wire
732.19  Cable and Wire
732.20  Power Service
732.21  Disconnect Switch with Enclosure

732.01  Vehicular Signal Heads, Conventional.  Ensure that vehicular traffic signal heads conform to the ITE “Vehicle Traffic Control Signal Heads” standard.  In conformance with the above standard, provide signal heads that are of cast nonferrous corrosion resistant metal, with plastic or glass lenses, and reflectors of either highly specular finished aluminum or silvered glass.  When provided, plastic lenses are ultraviolet stabilized, weather and impact resistant, and heat resistant so that operation does not cause crazing, cracking, deformation, color change, or other changes in physical properties.

Traffic signals consist of specified assemblies of optical sections containing 8 or 12-inch (200 or 300 mm) diameter colored lenses, a housing, a door frame with stainless steel hinge pins and latching device, gasketing, visor, reflector, wiring, lamp socket and includes an incandescent lamp in accordance with 732.04.  Twelve-inch (300 mm) lenses are the standard wide angle type.  Furnish lamp sockets that are rotatable for optimum lamp filament orientation.

Fit each optical section with a cutaway type visor unless other type visors or louvering is specified.  Ensure that the visors for 8-inch (200 mm) lenses are at least 7 inches (175 mm) long and those for 12-inch (300 mm) lenses are at least 9 1/2 inches (240 mm) long.

Ensure that optical sections are designed for assembly with all 8-inch (200 mm), all 12-inch (300 mm), or intermixed arrangements.  Assemble using suitable hardware that forms weatherproof joints with no light leakage from one section to another.  Ensure that the assembly arrangements contain the specified number of optical sections, lens size, lens color, and circular or arrow configuration.  Assemble from one to a maximum of five sections as specified to form a signal face.

Furnish multi-way heads with appropriate top and bottom brackets with an opening in the center of the top bracket provided for mounting purposes.  Correct signal face height inequalities for multi-way heads for proper accommodation between top and bottom brackets by the use of pipe spacers.

Furnish signal heads with required mounting hardware.  Furnish signal face orientation to traffic by serrated rings or other devices on housing sections and mounting hardware.  Permit adjustment in increments not greater than 5 degrees of rotation and not affected by wind gusts when locked.  Furnish galvanized steel or aluminum spacers and drop pipes 1 1/2 inches (38 mm) in diameter.  Ensure that disconnect hangers have at least twelve terminals unless a greater number is required.

Paint signal external surfaces with yellow enamel paint, Color 13655, Federal Standard 595.  Only paint interior surfaces of visors flat black.

732.02  Vehicular Signal Heads, Optically Programmed, 12-inch (300 mm) Lens.  Ensure that optically programmed signal heads incorporate an optical system projecting an indication that is programmed to be visible only within boundaries of a specific area.  Ensure that the optical system is capable of being veiled anywhere to within 15 degrees of the optical axis using procedures and opaquing material according to the manufacturer’s instructions.

Ensure that the signal sections conform to applicable portions of the ITE standard and 732.01.  Furnish and mount optical sections with a 12-inch (300 mm) lens size alone or in combination with additional sections of optically programmed or conventional optics types to form signal faces and heads.  Furnish an optically programmed signal section that includes an incandescent lamp.

Ensure that the housing design of optically programmed sections includes a ±10-degree tilt adjustment from the horizontal while maintaining a fixed mounting axis.

When required by the plans, include a dimmer in each signal section to automatically reduce lamp output during low ambient light conditions that is compatible with associated controller equipment.  Furnish a visor with each signal section.

732.03  Vehicular Signal Heads, Optically Programmed, 8-inch (200 mm) Lens.  Optically programmed signal heads with 8-inch (200 mm) lenses consist of a conventional 8-inch (200 mm) signal housing, reflector and door; and an extension portion which is attached in place of a conventional lens and which contains a lens system capable of optical programming.  Furnish the conventional signal housing with reflector and wiring, and the optical programmable extension portion according to the applicable requirements of 732.01 and 732.02.

When required by the plans, include a dimmer with each head to automatically reduce lamp output during low ambient light conditions that is compatible with associated controller equipment.  Furnish a cutaway visor with each signal section.  Ensure that the signal sections include an incandescent lamp.

Programming the 8-inch (200 mm) lens type head requires the use of an extender tool as recommended by the manufacturer to move the extension portion to the side to expose the optics for programming purposes.

732.04  Signal Lamps.

A.     Optically Programmed and Pedestrian Signal Lamps.  Ensure that optically programmed and pedestrian signal lamps conform to the ITE A Standard for Traffic Signal Lamps and Table 732.04-1.

B.     Vehicular Signal Lamps.  Prequalify all traffic vehicular signal lamps with the Office of Traffic Engineering (OTE) according to Supplement 1046.  Ensure that vehicular signal lamps conform to the ITE A Standard for Traffic Signal Lamps and Table 732.04-2.

In addition to the requirements of Table 732.04-2, provide model A-19 or AT-19 lamps for 8-inch (200 mm) and model A-21 or AT-21 for 12-inch (300 mm).  Supply a medium brass screw type base with reflection disk.  Furnish a C-11V or C-9 filament with a minimum of five hook supports for maximum filament stability.  Ensure that the lamp contains at least 85 percent Krypton gas.  Ensure that the voltage is a 120V ±10V, 60 hertz cycle.  Ensure that the lamp operates over the temperature range from -40 to 165 °F (-40 to 73.9 °C) and from 0 to 100 percent humidity.  Operate the lamp in the horizontal position.  Ensure that the glass envelope and base have a maximum seal temperature of 662 °F (350 °C).  Ensure that the glass is free of any impurities that might allow moisture build up within the lamp.  Ensure that the glass envelope of the lamp is indelibly marked to show:  original manufacturer’s identification, rated voltage, rated lumens, rated average life, rated wattage, date of manufacture, and batch code.

732.05  Pedestrian Signal Heads.  Furnish pedestrian signal heads that conform to the ITE Pedestrian Traffic Control Signal Indications.  Furnish signal heads that are complete units made up of two optical compartments with no leakage of light from one compartment to another.  Ensure that the signal heads alternately display the symbol of an upraised hand in portland orange and the symbol of a walking person in white light.  When shown on the plans, provide the legend “DON’T WALK “ in Portland orange and the legend” WALK “ in white light.  Furnish material for housings that consist of cast or sheet, corrosion resistant, non-ferrous metal.  Adequately reinforce the housings.  Ensure that the lens frames are non-ferrous metal or polycarbonate material.

Ensure that the lenses are glass or ultraviolet and impact-resistant plastic and display the legend with translucent symbols within an opaque black background.

Seal the lens to the door frame by the use of a weatherproof seal.  Furnish an elastomeric gasket between the door frame and housing to ensure a dust and weatherproof seal.

Use a signal head design that provides adequate dissipation of heat to ensure rated lamp life.

Ensure that the reflectors distribute light evenly from the source to the lens and are fastened or fitted securely in the compartment.  Furnish reflectors made of highly specular finished aluminum, silvered glass, porcelainized steel, or break resistant silvered plastic.  Finish reflector material to preserve the original reflective properties.

Fit each compartment of pedestrian signal heads with a visor that is at least 7 inches (175 mm) in length or, in lieu of visors, protect the entire face with a sunshade fastened close to the lens.  Furnish a black grid sunshade fabricated of high impact resistant plastic with a nominal depth of 1 1/2 inches (38 mm) and consisting of horizontal members spaced at not more than 1/2-inch (13 mm) and vertical members spaced appropriately.

For pedestrian signal head designs containing the legend “DONT” in the upper compartment and “WALK” in the lower compartment, ensure that the electrical circuitry is fail-safe such that if one compartment fails to light in orange, prevent the other compartment from lighting in orange.

Furnish pedestrian signal heads with required mounting brackets.  Furnish either pipe type brackets or, when compatible with the mounting position required by the plans, two-piece hinged type brackets that support the signal head close to the pole.

Furnish 1 1/2-inch (38 mm) galvanized steel pipe brackets with necessary fittings and adapters, and that are one-way or two-way as required.  Orient the signal face to crosswalks by selective meshing of serration rings or other devices provided on housings and mounting brackets.  Make adjustment in increments not greater than 5 degrees of rotation and that is not affected by wind gusts when locked.

Furnish two-piece hinged brackets of cast aluminum with stainless steel hinge pins, and when closed shall be secured by a tamperproof bolt.  Ensure that the mounting incorporates a terminal block for quick disconnect of field wiring.  Ensure that the mounting design permits attachment to the pole by banding, bolting or by lag screws in the case of wood poles.

Paint signal exterior surfaces black with enamel paint.  Only paint interior surfaces of visors flat black.

Furnish pedestrian signal head types according to Table 732.05-1. 

If specified, furnish the types listed below:

A.     Type A1.  Furnish a signal head that utilizes the housings of two 8-inch (200 mm) lens type vehicular traffic sections connected together to form a vertical unit.  Ensure that the sections have square lenses.  Ensure that the upper lens displays the symbol of an upraised hand in portland orange letters and the lower lens shall display symbol of a walking person in white letters.  Install a lamp in each section.

B.     Type A2.  Furnish a signal head that utilizes the housings of two 12-inch (300 mm) lens type vehicular traffic sections connected together to form a vertical unit.  Ensure that the sections have square lenses with the same symbol position as Type A1.  Install a lamp in each section.

C.     Type D2.  Furnish a single housing signal head with a lens in one piece or in two sections, one for each message.  Color and mask the lens to display in portland orange the symbol of an upraised hand from an upper compartment and the symbol of a walking person in white from a lower compartment.  Furnish reflectors and baffle that form two light compartments.  Install a clear glass incandescent lamp in each compartment.

732.06  Pedestrian Pushbuttons.  Furnish pushbuttons of sturdy construction that consist of a base housing and a removable cover.  Furnish components that provide a pushbutton with normally open contacts and that include all electrical and mechanical parts required for operation.  Ensure that the electrical circuitry is suitable for testing at 120 volts although a lower voltage is used when operating.

Ensure that the design of the pushbutton and its associated contacts and housing are sturdy and resistant to mechanical shocks and abuse.  Ensure that a concentrated force of 50 pounds (225 N) applied to the button or any exposed portion does not damage the unit or misadjusts the contacts.  Furnish a housing with a curved back surface for mounting on poles of various diameters.  Integrate the curved surface with the housing or supply an adapter with a flat back type housing.  Attach the cover assembly to the housing by stainless steel machine screws, resulting in a weatherproof and shockproof assembly.  Furnish a hole threaded for a 1/2-inch (13 mm) pipe in the housing for conduit attachment purposes.  Paint external surfaces yellow with enamel paint of Color 13655, Federal Standard 595.

Ensure that the maximum force required to operate the pushbutton is 5 pounds per foot (22.5 N).  Furnish a raised or flush pushbutton with a minimum of 2 inches (50 mm) at its smallest dimension.

Furnish pedestrian pushbutton signs that are a minimum of 0.07-inch (1.8 mm) steel or 0.10-inch (2.5 mm) aluminum.  Ensure that the legends and backgrounds are baked enamel paint for steel signs and enamel paint or non-reflective sheeting for aluminum signs.

732.07  Loop Detector units.

A.     NEMA TS-1.  Ensure that the loop detector units comply with the requirements of NEMA TS-1, section 15, with the following modifications.  Furnish shelf mounted loop detector units that are powered from 120 volts.  Use solid state isolated output units for all controller applications where directly connected to a solid state digital controller unit.  Ensure that the conductors in the cable harness for loop input pins are twisted three to five times per 1 foot (300 mm).

Ensure that the electrical connections for four-channel shelf-mounted units either are the 19-pin MS connector, as required by the foregoing specification, or consist of four connectors of the type required for single-channel shelf-mounted detector units.

If specified, design detector unit electrical connection plugs or wiring harness such that any multi-channel shelf-mounted detector unit may be readily replaced with single-channel detector units.  Accomplish this by furnishing only units with the connector type required for single-channel shelf-mounted detector units, or by wiring the controller back panel to single-channel harnesses which are, in turn, plug-connected to an adapter harness which is mated to the multi-channel connector of the detector unit.

B.     NEMA TS-2.  Furnish loop detector units according to NEMA Standards TS-2.

732.08  Loop Detector units, Delay and Extension Type.  Ensure that the loop detector units of this type comply with the requirements of NEMA TS-1, section 15.  Furnish shelf-mounted loop detector units that are powered from 120 volts.  Use solid state isolated output units for all controller application where directly connected to a solid state digital controller unit.  When specified, apply the provisions of 732.07 for possible replacement of multi-channel units with single channel units.

732.09  Magnetometer Detector units.  Ensure that the detection system is capable of satisfactory operation when the probes are installed in locations in close proximity to steel structure such as on or within bridges.  Ensure that each detector unit is suitable for connection with up to six sensor probes and with lead-in cable lengths up to 750 feet (230 m).  Furnish magnetometer detector units that comply with applicable requirements of 732.07.

732.10  Magnetometer Sensor Probes.  Furnish magnetometer sensor probes that are fully compatible with the detector unit supplied.  Furnish sensor probes that include attached leads of sufficient length for proper installation and ensure that the operation is satisfactory with up to six probes connected to a single lead.  Furnish probes that are moisture proof, corrosion resistant, and suitable for embedment within pavement holes with flexible sealant.

732.11  Signal Supports.  Furnish signal poles and mast arms that are tapered tubes of either a true continuous taper or of a type consisting of straight sections with a tapered effect accomplished by use of reducers.  Furnish tubes that are circular or regular polygons with six or more sides.  Ensure that any measurements of circular tube diameter at a specific point along the longitudinal axis do not vary by more than 3/16-inch (5 mm).  Ensure that the taper is between 0.54 and 1.3 percent.

Fabricate mast arms of the true continuous taper type in two portions joined by overlapping of sections with the overlap being at least 1 1/2 diameters as determined by the largest diameter of the outer portion.  Assemble the sections with a 5/8-inch (16 mm) minimum stainless steel or galvanized steel hex head through-bolt.

Ensure that there is not more than one longitudinal, automatically electrically welded seam on circular poles.  Ensure that the welded seams are neat and uniform in appearance and have a thickness not less than the base material and a bead height not exceeding 1/16-inch (2 mm).  Ensure that the wall thickness at each pole or arm cross-section is of uniform thickness, except at weld beads.  Do not place transverse seams or welds on true continuous taper type poles or arms, except on types consisting of straight sections.  Weld according to 513.17.

If using straight sections, relate the number of sections to pole or arm length according to Table 732.11-1.  Do not use section lengths less than 20 percent or more than 50 percent of the respective pole or arm length.

After fabrication, hot-dip galvanize poles and arms according to 711.02.

Do not use guy rods or truss-type arms.  Furnish poles and mast arms with attachment plates and gussets.  Assemble using high-strength bolts with the connection developing the full moment-resisting capability of the arm.  Do not allow the butt diameter of mast arms to exceed the nominal diameter of the pole at the point of attachment.

Fit poles with a welded-on cast or plate steel base designed to mount on an anchor bolt foundation and ensure that each pole includes the furnishing of anchor bolts and conduit ells for installation in the foundation.  Furnish at least one 2-inch (50 mm) diameter conduit ell for installation in each foundation.  Furnish conduit ells made from steel complying with 725.04; however, if they connect to non-metallic conduit, ensure that they are of the same non-metallic material.  Use steel anchor bolts with a minimum yield strength of 85,000 pounds per square inch (586 MPa) and galvanized according to 711.02.  Ensure that the galvanizing extends at least 2 inches (50 mm) beyond the threads.  Ensure that ends either are bent or have a drilled and tapped steel plate as shown on the plans.

Ensure that the poles include a handhole near the base oriented as required.  Reinforce the handhole with a welded-on steel frame with a grounding lug and fit it with a cover plate fastened by stainless steel screws.  Ensure that the poles also include a cable and wire support J-hook welded near the top and a removable pole cap.  Design poles and arms so their interiors conceal wiring and their mast arms include grommeted wire outlets for the signal heads.  Furnish hanger clamps with clevises on the mast arms for the signal heads as required.  Ensure that arm caps are made of steel and cover at least 50 percent of the end area.

Ensure that signal poles combining provisions for roadway lighting include an additional handhole located opposite the mast arm flange with the poles’ J-hook located above.

Furnish pedestrian pushbutton access holes and blind half couplings for controllers and pedestrian signal heads as required.  Plug any unused holes.

732.12  Strain Poles.  Furnish signal strain poles for the attachment of span wire that are steel tapered tubes according to the requirements of 732.11.  For embedded poles, do not use the portion below groundline in determining the taper.  Ensure that all poles include a removable pole cap, and messenger wire clamps with clevis and shackle unless otherwise specified.

Furnish anchor bolt foundation type strain poles that include a welded-on cast or plate steel base, bolt covers, a handhole, and a J-hook, as required by 732.11, and that also include at least one 2-inch (50 mm) cable entrance with a weatherhead and a welded blind half-coupling.  Ensure that the poles include the furnishing of anchor bolts and conduit ells for installation in the foundation.  Furnish at least one 2-inch (50 mm) diameter conduit ell for installation in each foundation.  Furnish steel conduit ells that comply with 725.04; however, if they connect to non-metallic conduit, ensure that they are of the same non-metallic material.

732.13  Wood Poles.  Furnish wood poles that conform to ANSI 05.1 “Specifications and Dimensions for Wood Poles”, that are made of Southern Pine or Western Red Cedar, and that are full-length pressure treated according to 725.19.

732.14  Down Guy Assemblies.  Furnish down guy assemblies according to 725.19.  Furnish insulators and hardware that conform to 732.18.  Furnish expanding or screw type anchors capable of withstanding a guy tension of 8000 pounds (35 kN) when installed in firm moist soil.

732.15  Pedestals.  Fabricate pedestals for the support of traffic control equipment of 4-inch (100 mm) schedule 40 steel or aluminum pipe.  Fit the steel pipe with a welded-on base of plate or cast steel, or when specified thread the steel pipe into a gray cast iron transformer type base.  Furnish galvanized steel pedestals according to 711.02.  Thread aluminum pipe into an aluminum cast transformer type base.  Design pedestals to mount on an anchor bolt foundation and include the furnishing of anchor bolts and conduit ells for installation in the foundation.

732.16  Conduit Risers.  Ensure that risers have conduit and fittings according to 725.04 and the weatherhead is made of aluminum or galvanized ferrous metal and threaded.

732.17  Cable Support Assemblies.  Ensure that the cable grip used with cable support assemblies is of the proper size and strength for the cables and is of the flexible “closed” or “split with rod” type, of stainless steel or tin coated bronze, and equipped with a single “U” eye bale.  Ensure that the smallest cable grip permitted has a minimum rated breaking strength of 250 pounds (1.1 kN).

Ensure that the slings for cable supports are made from copper clad or galvanized multi-strand steel wire with an overall diameter of not less than 1/8-inch (3 mm) and a breaking strength of at least 400 pounds (1.7 N).  Use thimbles to form eyes at each end of the sling with grooves to match the wire.  Adjust the sling to the proper length with the wire at each thimble lapped and secured with split bolt clamps.

732.18  Messenger Wire.  Furnish Utilities Grade messenger wire, twisted strand galvanized steel wire conforming to ASTM A 475, Class B, with the exception that tags according to Section 19.2 are not required on lengths less than 1000 feet (300 m), and that 1/4-inch (6 mm) seven-strand be high-strength.  Ensure that all accessories have a rated loading strength equal to or greater than the messenger wire minimum breaking strength.  Furnish galvanized steel helical lashing rods in 5-foot (1.5 m) lengths.

732.19  Cable and Wire.  Furnish cable and wire meeting the requirements of Table 732.19-1 and rated at 600 volts with conductors of copper unless otherwise specified.  Ensure that the cable or wire jacket is indelibly marked at intervals of not more than 6 feet (2 m) with nomenclature stating the size, the type, the organization specifying the type, and the manufacturer’s name or trademark.

732.20  Power Service.  Furnish risers for power service that are 1 to 1 1/2-inch (25 to 38 mm) diameter conduit and fittings according to 725.04.  Furnish weatherheads that are threaded and made of aluminum or galvanized ferrous metal.  Include a disconnect switch with enclosure.

732.21  Disconnect Switch with Enclosure.  Ensure that the switch enclosure is a UL listed watertight lockable stainless steel NEMA Type 4 supplied with the conduit hubs listed on the enclosure UL label.  Furnish an enclosure that contains as a minimum a single-throw, 2 pole, solid neutral, fused safety disconnect switch (or circuit breaker) UL listed as suitable for a service disconnect with a minimum capacity of 30-amperes at 240 VAC.  Ensure that the unit can be padlocked in both the “ON” and “OFF” positions.