Traffic Signal Field Technician
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update
1. No Communications between I/O cards and Processor. Uses individual signals to send
and receive in from the Detector rack to the CPU and from the CPU to the Load
Switches. - Correct Answer: TS1
2. Uses data bus or SDLC (Synchronous Data Link Control) communications
- Correct Answer: TS2
3. What/who should All Traffic Signal Work be performed or directly supervised by? -
Correct Answer: Journeymen electricians with a level 2 traffic control certification. Or a
electrical technician with a level 2 cert. Minimum 3 years experieince.
4. What does the power supply? - Correct Answer: BIUs/SIUs, detector racks and Load
switches/switch pack. 120V or 240V AC into DC
5. Cabinet monitor unit - Correct Answer: CMU
6. Malfunction management unit (detects probelms) - Correct Answer: MMU
,7. Read-only memory (ROM) chips have information stored in them by the manufacturer -
Correct Answer: ROM
8. Traffic controller - Correct Answer: The brain of the system
9. Random Access Memory; temporary memory. Is expandable, and resides on the
motherboard. - Correct Answer: RAM
10. How does a traffic controller work? - Correct Answer: Receives information from the
"Inputs", based on that information and how it is programmed, it will turn on the
appropriate lights. Can be shelf or rack mounted.
11. No sensors on the major movement phase however sensor on the minor movement
phase. Uses: highway operation where a minor movement phase crosses its path -
Correct Answer: Semi actuated control
12. Sensors on minor and major movement phases. Uses: Where 2 major intersections
cross. - Correct Answer: Fully control
13. Traffic light systems that are timed and controlled together to help run smoothly. -
Correct Answer: Co-ordinated control
14. Use of sensors and computers to adjust/change to traffic. Any type of congestion would
change it - Correct Answer: Adaptive control
15. Lights are on fixed time - Correct Answer: Fixed time traffic
, 16. Used for emergency vehicles and railroad crossings. Sends pre emption request ahead of
time to go through intersection. - Correct Answer: Pre emption
17. A direction that a vehicle or pedestrian can go. A movement reflects the users
perspective. - Correct Answer: Movement
18. NMU - Correct Answer: If it senses and changes it will change lights to flashing red.
19. A repetitive sequence of traffic signals - Correct Answer: Ring
20. A separation used between East/West movement from North/south movement. To
prevent certain movements at the same time - Correct Answer: Barrier
21. Defined as a controller timing unit associated with the control of one or more
movements. Each phase at an intersection has a set of timing, possibly containing
vehicle and pedestrian timing. A phase may control both a through movement and a
right turn movement on an approach. - Correct Answer: A phase
22. Operates like an inductive proximity sensor. Detects metal.
A monitoring unit which the loop is wired to send pulses of electricity many times per
second into the loop. Uses XLPE 14-20awg - Correct Answer: Inductive loop sensors
23. Inductive loops sensors - Correct Answer: The Lead in Cable is typically a twisted
pair, the twisting prevents crosstalk between other lead in wires. Once in the loop
portion, the wires are no longer twisted
24. Emits infrared which will reflect off any car in its path and return to the sensor no car no
reflection. - Correct Answer: Active infrared sensors
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update
1. No Communications between I/O cards and Processor. Uses individual signals to send
and receive in from the Detector rack to the CPU and from the CPU to the Load
Switches. - Correct Answer: TS1
2. Uses data bus or SDLC (Synchronous Data Link Control) communications
- Correct Answer: TS2
3. What/who should All Traffic Signal Work be performed or directly supervised by? -
Correct Answer: Journeymen electricians with a level 2 traffic control certification. Or a
electrical technician with a level 2 cert. Minimum 3 years experieince.
4. What does the power supply? - Correct Answer: BIUs/SIUs, detector racks and Load
switches/switch pack. 120V or 240V AC into DC
5. Cabinet monitor unit - Correct Answer: CMU
6. Malfunction management unit (detects probelms) - Correct Answer: MMU
,7. Read-only memory (ROM) chips have information stored in them by the manufacturer -
Correct Answer: ROM
8. Traffic controller - Correct Answer: The brain of the system
9. Random Access Memory; temporary memory. Is expandable, and resides on the
motherboard. - Correct Answer: RAM
10. How does a traffic controller work? - Correct Answer: Receives information from the
"Inputs", based on that information and how it is programmed, it will turn on the
appropriate lights. Can be shelf or rack mounted.
11. No sensors on the major movement phase however sensor on the minor movement
phase. Uses: highway operation where a minor movement phase crosses its path -
Correct Answer: Semi actuated control
12. Sensors on minor and major movement phases. Uses: Where 2 major intersections
cross. - Correct Answer: Fully control
13. Traffic light systems that are timed and controlled together to help run smoothly. -
Correct Answer: Co-ordinated control
14. Use of sensors and computers to adjust/change to traffic. Any type of congestion would
change it - Correct Answer: Adaptive control
15. Lights are on fixed time - Correct Answer: Fixed time traffic
, 16. Used for emergency vehicles and railroad crossings. Sends pre emption request ahead of
time to go through intersection. - Correct Answer: Pre emption
17. A direction that a vehicle or pedestrian can go. A movement reflects the users
perspective. - Correct Answer: Movement
18. NMU - Correct Answer: If it senses and changes it will change lights to flashing red.
19. A repetitive sequence of traffic signals - Correct Answer: Ring
20. A separation used between East/West movement from North/south movement. To
prevent certain movements at the same time - Correct Answer: Barrier
21. Defined as a controller timing unit associated with the control of one or more
movements. Each phase at an intersection has a set of timing, possibly containing
vehicle and pedestrian timing. A phase may control both a through movement and a
right turn movement on an approach. - Correct Answer: A phase
22. Operates like an inductive proximity sensor. Detects metal.
A monitoring unit which the loop is wired to send pulses of electricity many times per
second into the loop. Uses XLPE 14-20awg - Correct Answer: Inductive loop sensors
23. Inductive loops sensors - Correct Answer: The Lead in Cable is typically a twisted
pair, the twisting prevents crosstalk between other lead in wires. Once in the loop
portion, the wires are no longer twisted
24. Emits infrared which will reflect off any car in its path and return to the sensor no car no
reflection. - Correct Answer: Active infrared sensors
