955SIGNAL HEADS

955.1DESCRIPTION —This work is the furnishing and installation of assemblies for the control and

illumination of vehicular traffic signals, pedestrian signals, or lane control signals, which includes the appropriate housing and mounting hardware.

955.2MATERIAL—

• Traffic Signals-General. Section 950.2.

• Certification. Section 106.03(b)3.

• Plastic. Opaque polycarbonate resin molding, conforming to ASTM D3935. Federal yellow in color, except the inside of the visor, will have a non-reflective black finish.

ͦ Aluminum. Finish exterior of aluminum housings as follows:

Clean and coat surfaces of the signal housing, door, and visor, with an infrared, oven-baked, iron- oxide backing primer, conforming to Federal Specification TT-P-1757B and Federal Specification SSPC- Paint 25.

Coat finished surfaces, except the inside of the visor, with infrared, oven baked, highway yellow exterior enamel according to Federal Standard No. 595B. Finish the inside of the visor with phathalic anhydride, black, synthetic baking enamel, with zero gloss reflectance and conforming to MIL-E- 5557 Enamel Heating Resisting Glyceryl Phathalate, Type 4, Instrument Black.

Requests for black traffic signal housing require the approval of the Bureau of Operations. Highway Safety and Traffic Operations Division.

by which opening the door disables the indication.

• One-piece aluminum with a minimum thickness of 0.06 inch.

• Powder coated dull black (Federal Standard 595-37038) on both the front and back sides.

• Top, bottom, and sides that measure from 5 to 8 -inches in width.

• Rounded outside corners.

• Louvers with no louvers closer than 0.5 inch from the inner edge or 2.5 inches from the outer edge. Orient the louver so it is vertical on sides and horizontal on top and bottom.

• A minimum of four corner mounting attachment points per section head. Ensure attachment points do not interfere with the operation of the section head doors.

• Passivated stainless-steel type 316 or 304 screws, washers, and other installation hardware required to mount securely.

• Permanently marked manufacturer name, part/model number and date of manufacture on the back side.

• Universal backplates that fit all applicable PennDOT approved products.

• A minimum two inch fluorescent yellow, Type IX retroreflective border, placed flush with the outer edge of the backplate and placed no closer than 0.5-inch from all louvers.

• No sheeting is allowed over any louvered area.

with a non-reflective black finish.

• ITE Standard for “Vehicle Traffic Control Signal Heads, Light Emitting Diode (LED) Circular Signal Supplement”

• ITE “Vehicle Traffic Control Signal Heads – LED Vehicle Arrow Traffic Signal Supplement”

• MUTCD

Conform to the regulations, and as follows:

indications, that limits the visibility zone internally and optically, without the use of hoods or louvers. The projected signal may be visible or selectively veiled anywhere within 15 degrees of the optical axis.

10 degrees above and below the horizontal. Unless directed otherwise, assemble vertically mounted signals with a 4-degree tilt below the horizontal. Provide couplers, serrated locking rings, flanges, gaskets, and other hardware necessary to mate optically programmed signal sections together or to mate with non- optically programmed sections, all in a secure and weathertight manner. Shop-join the sections. Use corrosion resistant internal hardware.

Furnish lamps that provide luminous intensity of 950 beam candlepower, conforming to the traffic signal manufacturer's specification, rated at a minimum of 6,000 hours. Color code the internal wiring. Provide a breaker that disables the indication when the lamp door is opened. Provide an integral means within each signal face for regulating its luminous intensity between limits,

in proportion to the individual background illumination, but not less than 97% of uncontrolled intensity at 1,000 foot-candles; and reduce to 15% ± 2% of maximum intensity at less than 1 foot-candle, proportionally and instantaneously.

material and instructions. Within each section, affix a permanent, conspicuous warning label, advising of possible eye damage and fire hazard from the sun.

Heads,” the regulations, and as follows:

Traffic Control Signal Indications –Part 2: Light Emitting Diode (LED) Pedestrian Traffic Signal Modules” and the MUTCD. Provide verification from independent laboratory test results.

Conform to the regulations, and as follows:

intensity listed in the ITE Standard for “Pedestrian Traffic Control Signal Indications – Part 2: LED Pedestrian Traffic Signal Modules,” Section 3 “Photometric Requirement,” Subsection 4.1.1.

Standard for Pedestrian Traffic Control Signal Indications -Part 2: Light Emitting Diode (LED) Pedestrian Traffic Signal Modules and the MUTCD. Provide verification from independent laboratory test results.

Conform to the regulations, and as follows:

symbols (Don’t Walk and Walk), and a countdown timer consisting of 2, 7-segment digits constructed of LEDs. Provide numeric display either integral to, or separate from, the LED countdown pedestrian signal. If the numeric display is a separate component, the message display unit and the LED countdown numeric display unit must be approved as one system. Provide Upraised Hand and Walking Person symbols as solid, steady figures. Countdown digit indications must remain steady throughout the duration of the countdown interval.

go dark immediately if the pedestrian change interval is interrupted or shortened as part of a transition into a preemption sequence. The LED countdown pedestrian signal must be replaced with a solid, steady Upraised Hand indication.

• Equip the LED countdown pedestrian signal with a screen, visor, or other device to eliminate all phantom conditions.

• Furnish visors if the LED countdown pedestrian signal display will be visible to motorists stopped at a red traffic signal indication facing perpendicular to the display of the LED countdown pedestrian signal.

• Equip the LED countdown pedestrian signal timer to monitor the pedestrian change intervals and automatically adjust for any changes made at the controller.

• Provide a LED countdown timer module with an internal conflict monitor to prevent any possible conflicts between the Upraised Hand / Walking Person signal indications and the time display. When the steady Upraised Hand is illuminated, make it impossible to display any number other than zero.

• ITE Standard for “Lane-Use Traffic Control Signal Heads”.

• MUTCD.

• ITE Standard for Vehicle Traffic Control Signal Heads, Part 2: LED Vehicle Traffic Signal Modules, Sections 3, 5, and 6. Exclude Sections 6.3.2 and 6.4.2, Maintained Minimum Luminous Intensity.

and design that adequately supports the loading indicated and as shown on the Standard Drawings.

955.3CONSTRUCTION—Section 950.3, as shown on the Standard Drawings, and as follows:

be completed without approval of the District Traffic Engineer. Securely mount signal heads, using signal mounting brackets, where indicated, and according to the regulations. Install signal heads over roadways with the top of the housings at the same elevation and as shown on the Standard Drawings. If vehicular and pedestrian signals are to be installed on the same support, separate the assemblies. Aim vehicular signal heads, as directed, toward a point approximately 150 feet in advance of the stop line and in the center of the traveled traffic approach. Install louvers where it is necessary to restrict the view of the signal indications from an adjacent approach as specified in Section 955.3(c). Aim pedestrian signals to the far side of the crosswalk they are to control. Install backplates as specified in Section 955.2(b)3 and install visors as indicated. If installing a new retroreflective border to a backplate, ensure the backplate surface is clean and apply the retroreflective border at a pressure greater than or equal to20 pounds per square inch above 50F. Securely cover signals with an opaque material that covers and hides signal indicators from the view of traffic until the signal is put into operation. Use material that is sufficiently opaque to hide any lighted signal face indication. Burlap may be used as a hood material if the signal indications are not lighted and will not be until the hood is removed. Maintain the hood and replace or repair the hood if it becomes loose, torn, or removed.

head to restrict signal visibility to the area indicated.

955.4MEASUREMENT AND PAYMENT—

The price includes, when indicated, traffic signal housing, louvers, backplates, and mounting hardware.

The price includes, when indicated, traffic signal housing, tunnel visors, louvers, backplates, and mounting hardware.

The price includes, when indicated, traffic signal housing, louvers, and mounting hardware.

The price includes material and labor for addition of backplates to existing signal heads.