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IMSA level 1 Certification Exam with Solutions
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IMSA level 1 Certification Exam with Solutions
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IMSA level 1 Certification Exam with SolutionsWhat is the difference between concurrent and sequential phases? Correct Ans-
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? Correct
Ans-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? Correct Ans-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? Correct Ans-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? Correct Ans-Initial green time, passage/extension/gap
time, and max green time.
, IMSA level 1 Certification Exam with Solutions
At most intersections what are phases 2,6 called, and phases 4,8 called Correct Ans-Phases
2,6 are called Main Street, and 4,8 are called side street.
Name the three traffic signal systems? Correct Ans-Closed loop, central computer, hybrid
systems.
If phase 2 is in recall what will the controller do? Correct Ans-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? Correct Ans-Yellow interval, and is figured by using the approach speed of
the traffic.
What is an offset? Correct Ans-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.
The controller in a coordinated plan has a call on the side street what can it do to service that
call? Correct Ans-It can use the force off command to end the current phase to service the
side street.
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