IMSA Traffic Signal Technician Level 2 Certification
IMSA TRAFFIC SIGNAL TECHNICIAN LEVEL 2 | COMPLETE EXAM
2026/2027 | QUESTIONS AND 100% VERIFIED ANSWERS | PASS
GUARANTEE
1. What does the abbreviation NEMA stand for in the traffic signal
industry?
A. North American Electrical Manufacturers Association
B. National Electrical Maintenance Agency
C. National Engineering Municipal Authority
D. National Electrical Manufacturers Association
Correct Answer: D
2. Which NEMA standard introduced a serial communications bus
(SDLC) between the controller and cabinet field devices?
A. TS1
B. TS2
C. ATC 5201
D. Type 170
Correct Answer: B
3. In a NEMA TS2 Type 1 cabinet, what is the primary function of the
Bus Interface Unit (BIU)?
A. To translate SDLC serial data between the controller and cabinet I/O
devices
B. To supply regulated DC voltage to the controller
C. To monitor conflicting signal indications
D. To switch load current to the signal heads
Correct Answer: A
4. What is the main advantage of a NEMA TS2 Type 2 cabinet over a
Type 1 cabinet?
A. It requires no load switches
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, IMSA Traffic Signal Technician Level 2 Certification
B. It eliminates the need for a conflict monitor
C. It uses parallel hardwired interconnects instead of a serial bus while
retaining TS2 electrical standards
D. It only supports pedestrian phases
Correct Answer: C
5. The Advanced Transportation Controller (ATC) standard is also
known by which designation?
A. TS1 Type A
B. NEMA 250
C. ATC 5201
D. ITE TEES
Correct Answer: C
6. What is the primary purpose of a traffic signal controller unit?
A. To detect vehicle presence at the stop bar
B. To physically switch AC load current to signal lamps
C. To execute timing plans and select the appropriate signal phase and
interval
D. To provide surge protection to the cabinet
Correct Answer: C
7. In NEMA terminology, what is a 'phase'?
A. The time it takes a vehicle to clear an intersection
B. The physical wiring path from the controller to a signal head
C. A single signal indication such as red or green
D. A defined set of traffic movements that receive the right-of-way
together
Correct Answer: D
8. How many vehicle phases can a standard NEMA TS2 controller
typically support in a single ring?
A. Up to 2
B. Up to 16
C. Up to 8
D. Up to 4
Correct Answer: C
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, IMSA Traffic Signal Technician Level 2 Certification
9. What does 'ring' refer to in NEMA dual-ring controller architecture?
A. A backup power circuit for the controller
B. A physical loop of wire buried in the pavement
C. The housing that holds the conflict monitor
D. A sequential group of phases that must occur in a defined order and
cannot conflict with each other within the group
Correct Answer: D
10. In a standard NEMA dual-ring, 8-phase controller, which phases are
typically assigned to Ring 1?
A. 5, 6, 7, and 8
B. 2, 4, 6, and 8
C. 1, 3, 5, and 7
D. 1, 2, 3, and 4
Correct Answer: D
11. What is a 'barrier' (or 'phase concurrency group') in dual-ring
operation?
A. A backup battery enclosure
B. A physical guardrail installed at the intersection
C. A point in the sequence where both rings must transition together to
prevent conflicting movements
D. A type of detector zone
Correct Answer: C
12. Which cabinet component provides the physical interface allowing
the controller to be removed for bench testing without disturbing field
wiring?
A. The controller connector (or MS connector)
B. The load switch
C. The flasher unit
D. The conflict monitor
Correct Answer: A
13. What is the function of a load switch in a signal cabinet?
A. To switch high-current AC power to the field signal display circuits
based on low-voltage logic input
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, IMSA Traffic Signal Technician Level 2 Certification
B. To interconnect adjacent intersections
C. To store timing plans in nonvolatile memory
D. To detect approaching vehicles
Correct Answer: A
14. A Type 16 load switch is commonly used to control which circuits?
A. Only pedestrian signals
B. Only flashing beacons
C. Only detector amplifiers
D. Red, yellow, and green (or walk/don't walk) outputs for a single
channel
Correct Answer: D
15. What is the purpose of a flash transfer relay (FTR)?
A. To transfer the cabinet output from normal controller operation to
flashing operation
B. To switch between AC and DC power sources
C. To reset the conflict monitor after a fault
D. To control detector sensitivity
Correct Answer: A
16. What color combination does a cabinet typically flash when placed
into automatic flash due to a detected conflict?
A. Green-green on all approaches
B. All indications dark
C. Red-red on all approaches, or flashing yellow on the major street with
flashing red on the minor street per agency policy
D. Yellow-yellow on all approaches
Correct Answer: C
17. Which document governs the minimum functional, electrical, and
environmental requirements for NEMA traffic controller equipment?
A. The MUTCD
B. The NEMA TS2 Standard published by the National Electrical
Manufacturers Association
C. The ITE Traffic Engineering Handbook
D. The AASHTO Green Book
Page 4 of 47
IMSA TRAFFIC SIGNAL TECHNICIAN LEVEL 2 | COMPLETE EXAM
2026/2027 | QUESTIONS AND 100% VERIFIED ANSWERS | PASS
GUARANTEE
1. What does the abbreviation NEMA stand for in the traffic signal
industry?
A. North American Electrical Manufacturers Association
B. National Electrical Maintenance Agency
C. National Engineering Municipal Authority
D. National Electrical Manufacturers Association
Correct Answer: D
2. Which NEMA standard introduced a serial communications bus
(SDLC) between the controller and cabinet field devices?
A. TS1
B. TS2
C. ATC 5201
D. Type 170
Correct Answer: B
3. In a NEMA TS2 Type 1 cabinet, what is the primary function of the
Bus Interface Unit (BIU)?
A. To translate SDLC serial data between the controller and cabinet I/O
devices
B. To supply regulated DC voltage to the controller
C. To monitor conflicting signal indications
D. To switch load current to the signal heads
Correct Answer: A
4. What is the main advantage of a NEMA TS2 Type 2 cabinet over a
Type 1 cabinet?
A. It requires no load switches
Page 1 of 47
, IMSA Traffic Signal Technician Level 2 Certification
B. It eliminates the need for a conflict monitor
C. It uses parallel hardwired interconnects instead of a serial bus while
retaining TS2 electrical standards
D. It only supports pedestrian phases
Correct Answer: C
5. The Advanced Transportation Controller (ATC) standard is also
known by which designation?
A. TS1 Type A
B. NEMA 250
C. ATC 5201
D. ITE TEES
Correct Answer: C
6. What is the primary purpose of a traffic signal controller unit?
A. To detect vehicle presence at the stop bar
B. To physically switch AC load current to signal lamps
C. To execute timing plans and select the appropriate signal phase and
interval
D. To provide surge protection to the cabinet
Correct Answer: C
7. In NEMA terminology, what is a 'phase'?
A. The time it takes a vehicle to clear an intersection
B. The physical wiring path from the controller to a signal head
C. A single signal indication such as red or green
D. A defined set of traffic movements that receive the right-of-way
together
Correct Answer: D
8. How many vehicle phases can a standard NEMA TS2 controller
typically support in a single ring?
A. Up to 2
B. Up to 16
C. Up to 8
D. Up to 4
Correct Answer: C
Page 2 of 47
, IMSA Traffic Signal Technician Level 2 Certification
9. What does 'ring' refer to in NEMA dual-ring controller architecture?
A. A backup power circuit for the controller
B. A physical loop of wire buried in the pavement
C. The housing that holds the conflict monitor
D. A sequential group of phases that must occur in a defined order and
cannot conflict with each other within the group
Correct Answer: D
10. In a standard NEMA dual-ring, 8-phase controller, which phases are
typically assigned to Ring 1?
A. 5, 6, 7, and 8
B. 2, 4, 6, and 8
C. 1, 3, 5, and 7
D. 1, 2, 3, and 4
Correct Answer: D
11. What is a 'barrier' (or 'phase concurrency group') in dual-ring
operation?
A. A backup battery enclosure
B. A physical guardrail installed at the intersection
C. A point in the sequence where both rings must transition together to
prevent conflicting movements
D. A type of detector zone
Correct Answer: C
12. Which cabinet component provides the physical interface allowing
the controller to be removed for bench testing without disturbing field
wiring?
A. The controller connector (or MS connector)
B. The load switch
C. The flasher unit
D. The conflict monitor
Correct Answer: A
13. What is the function of a load switch in a signal cabinet?
A. To switch high-current AC power to the field signal display circuits
based on low-voltage logic input
Page 3 of 47
, IMSA Traffic Signal Technician Level 2 Certification
B. To interconnect adjacent intersections
C. To store timing plans in nonvolatile memory
D. To detect approaching vehicles
Correct Answer: A
14. A Type 16 load switch is commonly used to control which circuits?
A. Only pedestrian signals
B. Only flashing beacons
C. Only detector amplifiers
D. Red, yellow, and green (or walk/don't walk) outputs for a single
channel
Correct Answer: D
15. What is the purpose of a flash transfer relay (FTR)?
A. To transfer the cabinet output from normal controller operation to
flashing operation
B. To switch between AC and DC power sources
C. To reset the conflict monitor after a fault
D. To control detector sensitivity
Correct Answer: A
16. What color combination does a cabinet typically flash when placed
into automatic flash due to a detected conflict?
A. Green-green on all approaches
B. All indications dark
C. Red-red on all approaches, or flashing yellow on the major street with
flashing red on the minor street per agency policy
D. Yellow-yellow on all approaches
Correct Answer: C
17. Which document governs the minimum functional, electrical, and
environmental requirements for NEMA traffic controller equipment?
A. The MUTCD
B. The NEMA TS2 Standard published by the National Electrical
Manufacturers Association
C. The ITE Traffic Engineering Handbook
D. The AASHTO Green Book
Page 4 of 47
