2-6-11 Traffic Signal Hardware and Equipment Flashcards
The top of a signal lens is labeled to ensure that it is positioned correctly in the signal face.
True
The two types of signal visors are cut-a-way and __?__.
tunnel
A signal head with three 12-inch sections would be referred to as a __?__.
12-12-12
A 150-watt traffic signal lamp is required to illuminate the red lens in an eight-inch signal section.
False
Traffic signal lamps are typically rated for __?__ of use.
8,000 hr
Backplates are used to increase the __?__ of the signal faces.
visibility
The bottom of a pedestrian traffic signal head must be at least seven feet above the sidewalk.
True
When used in pedestrian signal heads, an LED module consumes the same amount of power as an incandescent lamp with an equal wattage rating.
False
A typical size for a pedestrian signal head section is __?__.
12 × 12
The traffic signal industry has not adopted international symbols for pedestrian signals.
False
The 12-inch section of a pedestrian signal head requires a __?__ incandescent lamp to illuminate the lens.
116 W
The time allowed for the pedestrian to finish crossing the street before conflicting vehicle traffic is allowed to proceed is known as pedestrian __?__.
clearance interval
The countdown timer is only displayed during the time that the flashing DON’T WALK appears.
True
An audible pedestrian signal sends a distinctive tone during the __?__ interval
WALK
Pedestrian push buttons should be installed at __?__ above the finished grade.
42”
Audible pole locators use a tone with a slower pulse interval than audible pedestrian signals.
True
Mastarms are based on a __?__ design.
cantilever
Wind load on a mastarm is rated in pounds per square inch.
False
In a mastarm intersection, the traffic signal cable is protected from exposure to the weather.
True
When installing a plumbizer, the single set screw should be positioned on the __?__ side of the plumbizer.
bottom
When properly installed, the bottom of traffic signal heads will be at least __?__ above the traveled roadway.
15’
In a span wire intersection, the __?__ wire carries the signal cable across the span.
messenger
A strand vise kit contains a strand vise, a clip, and a __?__.
bail
Signal cables are attached to tether wires by the use of cable rings.
False
When installing a ceramic insulator in a span, both bails must interlock with each other and pull across the thickest part of the insulator.
True
The balance adjuster of a span wire hanger assembly is also called a __?__.
gooseneck
On span intersections where tether wires are used, a tether __?__ assembly needs to be installed on the bottom of the signal head.
clamp
Pedestrian poles or pedestal poles are used at intersection corners where no structural support is required for mastarms or span wires.
True
