IMSA / Traffic Signal Technician Level II (Latest 2024/ 2025 Updates STUDY BUNDLE WITH COMPLETE SOLUTIONS) Questions and Verified Answers| Grade A| 100% Correct
IMSA Traffic Signal Technician Level II
(Latest 2024/ 2025 Update) Questions and
Verified Answers| Grade A| 100% Correct
Q: When dealing with the public, keep in mind that the routines of public users may be
disrupted for periods of time during construction. How should a traffic signal field technician
interact with the public? (5)
Answer:
Always be polite
Be confident when speaking
Communicate clearly in understandable terminology
Don’t argue or threaten
Don’t provide information if you are uncertain of its accuracy.
Q: Traffic signal controller units of todays traffic systems are controlled by what?
Answer:
Microprocessor
Q: The microprocessor is programmed to recognize what?
Answer:
Input requests from vehicle detection systems
Q: A microprocessor takes appropriate action to control intersection what?
Answer:
Timing
Q: A forerunner of the electronic controllers that we have today was the?
Answer:
Electro-mechanical controller
Q: What year where solid state electronic controllers developed to replace the electromechanical controllers?
Answer:
1970’s
Q: What two improvements differentiated electronic controllers from electro-mechanical
controllers?
Answer:
More dependable
Added many more features
Q: What was the standardization that primarily established a pin configuration in the controller
and defined a function for every pin?
Answer:
NEMA TS-1
Q: The NEMA TS-1 has three connectors which where known as:
Answer:
A,B, and C connectors
Q: NEMA TS-1 had how many connectors?
Answer:
Three
Q: The NEMA TS-1 defined every pin for each connector as either what two connection types?
Answer:
Input or Output
Q: NEMA also allowed manufactures to add an additional feature on the fourth connector.
What was this connector know as?
Answer:
D connector
Q: What was the D connector commonly used for?
Answer:
Communications
Pre-emption
Other special features
Q: What three agencies joined together to help develop the 170 controller?
Answer:
California DOT
City of Los Angeles California
New York State DOT
Q: What controller is an open-architecture based general purpose microcomputer for traffic
control?
Answer:
Model 170 controller
Q: What two specifications does the model 170 controller require?
Answer:
A specific hardware architecture
A specific processor
Q: How is the Type 179 controller specification similar to the 170 specification?(2)
Answer:
Open architecture
Allows for interchangeability of components
Q: What is the primary difference between the 179 and 170 controller
Answer:
Uses a different microprocessor
Q: Who developed the model 2070 controller?
Answer:
CALTRANS
Q: The 2070 was introduced to supersede which controller?
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IMSA Traffic Signal Technician Level II |
Questions and Verified Answers| Grade A|
100% Correct (2024/ 2025 Update)
Q: An intersection that has four through phases and four left turn phases are considered how
may phases together ?
Answer:
Eight phase intersection
Q: Each phase is comprised of intervals ?
True or false ?
Answer:
True
Q: (Interval )is based on?
Answer:
The amount of TIME that a particular indication is given during a phase
Another words, the total time assigned to a specific display.
Q: An example of an ( interval ) is?
Answer:
” the amount of time that a green indication is given during a particular phase. ” (know as a
“green _ )”
Q: (Ring) in a traffic signal controller is?
Answer:
A Series of conflicting phases that occur in simultaneously( same time ) with each other
Q: What are the two typically ( ring ) that a traffic controller have ?
Answer:
“Single-ring” or “dual ring”
Q: What are other ( rings ) that are rarely used ? And when are these types of rings used for?
Answer:
3 or 4 rings &
(used for two or more separate intersections are controlled by a single controller)
Q: What is a ( barrier) ?
Answer:
Is a boundary point in the preferred sequence. Barrier that separates something so it won’t have
in the same time.
Q: How many (barriers) does a “dual ring controller” have?
Answer:
Two , one for leaving the MAJOR street and one for leaving the MINOR street.
Q: _ ensure that green indications will not be given to conflicting movement at the
intersection at the same time.
Answer:
Barriers
Q: What is a ( concurrent phase) ?
Answer:
Are movements that happen at the same time because do not conflict ( collide) with one another.
Q: Example of a ( concurrent phase )
Answer:
A Through movement and a adjacent left turn movement can move on the same time.
Q: What is a (sequential phase)?
Answer:
Cannot happen at the same time because they conflict with one another ( collide)
Q: In a ” sequential phases ? How many movements can it have?
Answer:
Only one phase is served at a time
Q: Traffic signal industry has developed basic standards that provide common terms snd
concept , but the most important thing is to have an understanding of your_______
Answer:
Local agency standards
Q: What is (traffic signal timing)?
Answer:
The assignment of specific number of seconds for each interval of each controller timing
function.
Q: __ are a more detailed assignment of specific portions of time within a phase.
Answer:
Phase intervals
Q: phase intervals can be ?
Answer:
Green, yellow , red and pedestrian intervals
Q: A green interval is ?
Answer:
Is the total time assigned to the green indication for a phase whether sequential or concurrent.
Q: Minimum green or initial green time is?
Answer:
Is the absolute minimum time that the green indication must be displayed.
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Traffic Signal Technician Level II (Latest
2024/ 2025 Update) Questions and Verified
Answers| Grade A| 100% Correct
Q: Check for proper operating DC voltage, check for the absence of red on a phase that does
not have green, yellow, or walk, check on a simultaneous are functions that are provided by both
Answer:
CMU and MMU
Q: What is the purpose of relays in a traffic signal system?
Answer:
to transfer the outputs from one component to another
Q: What device minimizes the amount of voltage that might be available at a pedestrian push
button should the button malfunction?
Answer:
Isolator
Q: Which of the following combinations would cause the signal to enter flashing mode
according to NEMA?
Answer:
green & yellow
yellow & red
walk & yellow
Q: What feature is included in the 170 or 2070 monitors vs. the NEMA monitor?
Answer:
plug in
Q: Which group of features best describes why malfunction monitoring units are more
advanced then conflict monitors?
Answer:
ethernet connections
monitoring SDLC communications
RS-232 communications port
Q: Which type of power supply lines are attached from the power supply (service) inside the
power panel?
-120 v, 40 H, single phase, AC+ and AC-
- 120 v, 60 H, single phase DC+ and DC-
- 120 v, 60 H, single phase AC+ and AC-
- 240 v, 60 H, single phase AC+ and ACAnswer:
120 v, 60H, single phase, AC+ and ACQ: What is NOT an improved feature of the NEMA TS-2 power supply, when compared to the
NEMA TS-1 power supply?
Answer:
24 V DC power for solar panels
Q: At what time can a mercury contactor be disposed of in a typical trash collection receptacle?
Answer:
it can never happen
Q: List what is a part of the permanent emergency generator system?
Answer:
uninterrupted supply of power
direct connection to the power supply panel
external fuel source
Q: What is a direct current (DC)?
Answer:
an electrical current that has a unidirectional flow of electric charge
Q: A transformer/rectifier is used to supply __ VDC to electronic components?
Answer:
24
Q: What type of circuit is the current through each of the components the same?
Answer:
series
Q: Voltage is the electrical driver that moves what type of charged electrons through wires and
electrical devices?
Answer:
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