3834.1SCOPE
Provide standard traffic control signal heads to control vehicle movements as part of a traffic control signal system or Ramp control signal.
3834.2REQUIREMENTS
A Standard ITE Vehicle Signal Heads Use standard ITE black polycarbonate vehicle signal housings listed on the APL, Signals unless otherwise specified in the Contract. Use adjustable-type vehicle signal housings capable of 360° rotation about a vertical axis. Use vehicle signal heads made up of at least 3 separate vehicle signal sections. Ensure each vehicle signal section consists of a housing, housing door, visor, optical unit, and wiring.
Provide and install the required through-bolts for connecting the individual sections. Fasten together the signal sections above or below the straight or angle mount by means of a noncorrosive 3-bolt mounting assembly. Use locknuts for the 3-bolt mounting assembly to prevent the assembly from loosening. Arrange vehicle signal sections in a vehicle signal head in accordance with Part IV, “ Highway Traffic Signals” of the MN MUTCD. For each Intersection, install standard ITE vehicle signal heads from the same manufacturer. Install and mount each vehicle signal head at the location shown on the Plans. Always provide vehicle signal heads with provisions to attach a background shield, regardless of the Contract requirement for background shields. A.1 Visor Provide each signal section of each signal head with a removable visor. Use visors meeting the following characteristics:
visor and the housing door
Mount the visor with twist-on slots and stainless steel screws positioned for vertical or horizontal mounting of the signal section, and with a downward tilt of at least 3 degrees. For traffic control signal system heads, provide tunnel-type visors that enclose 80 percent of the lens circumference. A.2 Signal Indications Use LED signal indications listed on the APL, Signals. A.3 Backplates (Background Shields) Use backplates listed on the APL, Signals B Mounting Vehicle and Pedestrian Signal Heads Mount vehicle and pedestrian signal heads using straight, angle, or two-way plumbizer signal mounts. Provide signal head mounts and required appurtenances for mounting vehicle and pedestrian signal heads to mast arms, vertical pole shafts, and pedestal shafts. Use straight, angle, or two-way plumbizers listed on the APL, Signals. Provide and install metal support plates on the inside of the signal section at the attachment point of the straight or angle mount plumbizers or signal bracketing. Provide and install angle and straight mount caps when installing pedestrian indications. Only use angle and straight mount caps listed on the APL, Signals. Provide four and five-section signal heads and signal head mounting spacers at the point of mounting to the plumbizer. Use signal head mounting spacers listed on the APL, Signals.
C Signal Brackets and Pipefittings If the Contract specifies signal brackets and pipe fittings for mounting vehicle and pedestrian signal heads, provide signal brackets and pipe fittings in accordance with the following:
pipe fitting for signal brackets and pipe fittings for mounting vehicle and pedestrian signal heads
alignment, to allow programming of optically programmed vehicle signal heads, or of a length directed by the Engineer
fasten vehicle and pedestrian signal heads to signal bracketing and pipe fittings fabricated of anodized aluminum and traffic signal Industry Standard signal hardware
securely assembled
watertight, and free of sharp edges or protrusions to prevent damage to the traffic control signal conductor insulation
3834.3SAMPLING AND TESTING
Obtain the Engineer’s approval before installing the Material specified in this section.
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