2-6-14 Introduction to Traffic Signal Cabinets and Equipment Flashcards
In 1976, __?__ released a set of traffic signal standards known as TS-1.
NEMA
What device in the cabinet switches the 120 VAC output to the signal heads?
load switches
All of the traffic signal components are housed in a weathertight cabinet.
Trure
A Type 2 controller cannot be used in a TS-1 cabinet.
False
The two categories of AC and DC voltage levels are input voltage and __?__ voltage.
output
The most popular choice for methods of vehicle detection is a __?__.
inductive loop detector
A flash __?__ relay is used to switch the signals from a normal operating condition to a flashing condition
transfer
The key to the success of the 170 controller is because it specifies which __?__ to use.
microprocessor chip
The key to the success of the 170 controller is because it specifies which __?__ to use.
protocol
A Type 2 dual-circuit output flasher plugs into a __?__ socket.
6-pin
The channels display on the conflict monitor tells __?__ the problem occurred.
where
One problem with electro-mechanical controllers is that signals would become stuck due to the dial unit not turning in __?__ weather.
cold
Who is credited with providing the concept for today’s four-way traffic signal?
Garrett A. Morgan
The electro-mechanical controllers made by different manufacturers all operate on the same principle.
True
Where did the world’s first traffic signal become operational?
London
