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IMSA TRAFFIC SIGNAL TECHNICIAN LEVEL 1 EXAM QUESTIONS AND
CORRECT ANSWERS 2025/
The only point in the cycle of a coordinated traffic signal controller were the major street phase is allowed to end is called? - ANSWER: Yield Point Which of the following is not a common mode of operation for timing plans in a signal system: A. Period time of day B. Traffic related C. Traffic responsive D. Traffic adaptive - ANSWER: B Two common terms to describe traffic signal supports in single heads are: A. Rigid and free swinging B. Rigid and loose C. Fixed and loose D. Mast and free - ANSWER: A In a single wire with a single point attachment configuration, the wire that supports the signal heads is called the - ANSWER: Messenger wire The two nominal diameter sizes for vehicular signal lenses area. A. 4 inches and 8 inches be. B. 8 inches and 12 inches seE C. 12 inches and 16 inches D. 16 inches and 20 inches - ANSWER: B The purpose of "Louvers" is to:
A. Cut down on Sunglen her B. Makes signal appear brighter C. Make signal visible from a specific Lane D. Change the color of the signal - ANSWER: C Which of the following types of conduit are used for traffic signals? A. rigid steel conduit B. High density polyethylene C. PVC schedule 40 D. All of the above - ANSWER: D What is the primary function of IMSA? a. Teaching design issues b. Safety education c. Signal manufacturing training d. Install traffic signals - ANSWER: b IMSA stands for? - ANSWER: International Municipal Signal Association Traffic signal supports are not used to display the following item: A. guide signs B. advertisements C. regulatory signs D. overhead street sign names - ANSWER: B Which of the following is a disadvantage of mast arms: A. Higher when loading capabilities B. Short construction time C. Large foundation
What are the two indications on a ped head and their colors? - ANSWER: Walking man - white, upraised hand - Portland orange Components of the optical unit for an incandescent lamp include all of the following except: A. lamp socket B. Shade C. Lens D. Reflector - ANSWER: B For pedestrian signals controlling crosswalks less than 100 feet, what is the required height of the symbol themselves? - ANSWER: At least 6 inches Loop detectors operate on the principle of? - ANSWER: Inductance The piece of cable that connects the controller cabinet to the loops is called a? - ANSWER: Lead in cable The outer jacket of Loop lead in the cable is typically made of? - ANSWER: Polyethylene What is the advantage of video detection systems? A. Low-cost B. Ease of installation in alignment C. Images can be sent to remote locations D. Can assist in traffic law enforcement - ANSWER: C
Which of the following is a type of microwave detector: A. Ground penetrating radar B. Frequency modulated continuous wave C. Inductance loop detectors D. Low frequency radio waves - ANSWER: B A 6' x 60' loop typically has how many turns of wire? - ANSWER: Two A 6' x 20' loop requires how many turns? - ANSWER: 3 A 2' x 6' loop requires how many turns? - ANSWER: 5 The primary function of the CMU is: A. change signal indications B. keep clock for signal C. Monitor signal operations D. Prevent conflicting signal egg indications - ANSWER: D What is not part of an overhead power service: A. pole box B. A power supply wires C. Conduit riser with weatherhead D. Meter housing - ANSWER: A Typical back up battery systems provide battery power in case of an outer edge to a signal for how many hours? - ANSWER: 2 to 6 hours A major distinguishing feature between NEMA TS- 1 and TS- 2 controllers is: A. Display
Which of the following is an example of adequate fall protection during the operation of aerial lift equipment? A. Full body harness B. Safety belt C. Rails of a platform lift D. All of the above - ANSWER: D A work zone supervisor is responsible for which of the following tasks: A. Maintaining the project schedule B. Ensure advance warning devices have not been removed or relocated C. Enforce traffic laws in the work zone D. All of the above - ANSWER: B Which of the following is not a sentence type in the MUTCUD: A. standards B. guidance C. Objectives D. support - ANSWER: C Which of the following is an example configuration of an emergency vehicle traffic control signal: A. two section traffic signal with circular green and circular read indications beer. B. Three section traffic signal with circular read, circular yellow, and smaller circular yellow indications s C. Two section traffic signal with circular green and circular yellow indications D. None of the above - ANSWER: B The following faces are typically assigned to the major street through approaches: - ANSWER: 2 and 6
The green interval is made up of which three components? - ANSWER: Minimum green, passage time, maximum green What are the three typical types of recall features of a traffic signal controller? - ANSWER: Minimum, maximum, pedestrian Any coordination plan, what is the number of seconds given to each phase at the intersection? - ANSWER: The split Which of the following traffic signal coordination methods is typically the least expensive? - ANSWER: Time-based coordination Which of the following is a definition for cycle length: A. The amount of time given to a particular indication during a particular phase B. The elapsed time between the start of a specific display until that display comes up again C. The amount of time given to the left turning movements of the signalized intersection D. The amount of time given to a single phase of the intersection - ANSWER: B Which of the following is a characteristic of sequential phases: A. They cannot occur at the same time B. They are the phases numbered one to 4 C. They are the odd-numbered phases D. None of the above - ANSWER: A Which of the following is a definition for initial green Time: A. minimum time that the green indication must be displayed
What is the definition of short term work zone as per the MUTCD? - ANSWER: 1 hour or less What's OSHA? - ANSWER: Occupational and safety health administration Can you get your level III certification and what are they? - ANSWER: Yes, and it's for bench and field electrician I'm working near power lines where would I get my clearance from? - ANSWER: CEC, NEC, NESC What are the three basic types of beacons? - ANSWER: Stop sign beacon, warning beacon, and flashing beacon. What is the difference between concurrent and sequential phases? - ANSWER: 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? - ANSWER: The dual ring phases are 2,4,6,
What is the cheapest way to coordinate a corridor of signals? What needs to stay the same throughout the day? - ANSWER: 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? - ANSWER: 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? - ANSWER: 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 - ANSWER: Phases 2,6 are called Main Street, and 4,8 are called side street. Name the three traffic signal systems? - ANSWER: Closed loop, central computer, hybrid systems. If phase 2 is in recall what will the controller do? - ANSWER: The controller will service that phase even if there is no need for it.
12" signal heads can be used without side a pole support heads on a to a intersection? - ANSWER: Minimum 40 foot maximum 120 foot intersection. The a.d.a of 1990 ensures no discrimination against people who have disabilities? - ANSWER: True. Are pull/ junction boxes only used where wire needs to change direction? - ANSWER: No What is used to shade signal indications from the sun and allow it be seen from the lane intended? - ANSWER: Visors. Signal heads that are are to only be seen from a specific area on the road? - ANSWER: Visibility limited. assemblies provide the maximum support length to cross over a street? - ANSWER: Truss type assemblies. You can use the same type signal head on a mast arm and truss supports?
- ANSWER: Mounting hardware.
A loop detector sends a message to the controller's input file because it (increases or decreases) the inductance frequency. - ANSWER: Decreases There are (Two or three) turns of wire in a standard loop that is 6' x 20' - ANSWER: Three Would a solar detector be a common way to detect for traffic at a traffic signal? Yes or no? - ANSWER: No List three ways Doppler microwave detectors can check for vehicles? - ANSWER: Volume, occupancy, classification For one to maintence you must close the lane of travel. - ANSWER: Loop detectors A loop detector that is made up of two long rectangles right next to each other is called a? - ANSWER: Quadrupole loop If I ask for some #10 AWG wire, what does AWG stand for? - ANSWER: American Wire Gauge
