Exam (elaborations)
IMSA LEVEL 1 CERTIFICATION QUESTIONS AND ANSWERS
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IMSA LEVEL 1 CERTIFICATION QUESTIONS AND ANSWERS
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IMSA LEVEL 1 CERTIFICATION QUESTIONS ANDANSWERS
Where are you when you install alternating flashing 12" red lights? - Answers-At a
railroad crossing.
Who determins the the standards on traffic control devices and sets the requirements
for uniformity? - Answers-The Manual on uniform traffic control devices, (MUTCD).
What is the the voltage that a traffic signal cabinet needs to run all its components? -
Answers-120 volts AC
What is the difference between concurrent and sequential phases? - Answers-
Concurrent phases, phases that run together. Sequential phases, are phases that run
one at a time.
I have a dual ring controller and all my through phases are even, what do I mean? -
Answers-The dual ring phases are 2,4,6,8
What is the cheapest way to coordinate a corridor of signals? What needs to stay the
same throughout the day? - Answers-Time based coordination, and cycle length.
Explain the white walking man, the flashing orange hand on a ped head and how is this
time figured? - Answers-The white walking man is the ped head walk interval, and the
ped change clearance interval is the flashing orange hand.
What makes up the green interval? - Answers-Initial green time, passage/extension/gap
time, and max green time.
At most intersections what are phases 2,6 called, and phases 4,8 called - Answers-
Phases 2,6 are called Main Street, and 4,8 are called side street.
Name the three traffic signal systems? - Answers-Closed loop, central computer, hybrid
systems.
If phase 2 is in recall what will the controller do? - Answers-The controller will service
that phase even if there is no need for it.
What happens after the green interval and before the red interval, and how is this
change interval figured? - Answers-Yellow interval, and is figured by using the approach
speed of the traffic.
What is an offset? - Answers-The time it takes from the start of the green interval in a
coordination timed intersection and a system reference point along side the road.
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