1 | Page
IMSA level 1 certification Questions and
Answers
Where are you when you install alternating flashing 12" red lights?
Ans: At a railroad crossing.
Who determins the the standards on traffic control devices and
sets the requirements for uniformity?
Ans: The Manual on uniform traffic control devices, (MUTCD).
What is the the voltage that a traffic signal cabinet needs to run
all its components?
Ans: 120 volts AC
Where are you when you come across a signal that has a ped pole
on each side of the road, each having a 3 section signal on top
followed with a 2 section mounted directly under neath?
Ans: A ramp meter on a ramp to a highway.
What is a flashing signal along the road called?
Ans: A flashing beacon.
What is the definition of short term work zone as per the MUTCD?
Ans: 1 hour or less
What's OSHA?
Ans: Occupational and safety health administration
Can you get your level III certification and what are they?
Ans: Yes, and it's for bench and field electrician
© 2025 All rights reserved
, 2 | Page
I'm working near power lines where would I get my clearance
from?
Ans: CEC, NEC, NESC
What are the three basic types of beacons?
Ans: Stop sign beacon, warning beacon, and flashing beacon.
What is the difference between concurrent and sequential phases?
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?
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?
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?
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?
Ans: 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
Ans: Phases 2,6 are called Main Street, and 4,8 are called side street.
Name the three traffic signal systems?
© 2025 All rights reserved
IMSA level 1 certification Questions and
Answers
Where are you when you install alternating flashing 12" red lights?
Ans: At a railroad crossing.
Who determins the the standards on traffic control devices and
sets the requirements for uniformity?
Ans: The Manual on uniform traffic control devices, (MUTCD).
What is the the voltage that a traffic signal cabinet needs to run
all its components?
Ans: 120 volts AC
Where are you when you come across a signal that has a ped pole
on each side of the road, each having a 3 section signal on top
followed with a 2 section mounted directly under neath?
Ans: A ramp meter on a ramp to a highway.
What is a flashing signal along the road called?
Ans: A flashing beacon.
What is the definition of short term work zone as per the MUTCD?
Ans: 1 hour or less
What's OSHA?
Ans: Occupational and safety health administration
Can you get your level III certification and what are they?
Ans: Yes, and it's for bench and field electrician
© 2025 All rights reserved
, 2 | Page
I'm working near power lines where would I get my clearance
from?
Ans: CEC, NEC, NESC
What are the three basic types of beacons?
Ans: Stop sign beacon, warning beacon, and flashing beacon.
What is the difference between concurrent and sequential phases?
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?
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?
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?
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?
Ans: 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
Ans: Phases 2,6 are called Main Street, and 4,8 are called side street.
Name the three traffic signal systems?
© 2025 All rights reserved
