IMSA Traffic Signal Technician Level II |
Questions and Verified Answers | Grade A
| 100% Correct (2025/ 2026 Update)
Section 1: Traffic Signal Phasing and Timing (Questions 1–
20)
1. An intersection with four through phases and four left turn phases is considered
how many phases together?
A. Four
B. Six
C. Eight
D. Ten
Answer: Eight
Rationale: An intersection with four through phases and four left turn phases totals eight
phases, as each phase represents a specific movement.
2. Each phase is comprised of intervals. True or false?
A. True
B. False
Answer: True
Rationale: Each phase consists of intervals (e.g., green, yellow, red) that control signal
timing.
3. An interval is based on:
A. The number of vehicles
B. The amount of time assigned to a specific display
C. The type of controller used
D. The weather conditions
Answer: The amount of time assigned to a specific display
Rationale: An interval is the duration a specific signal indication (e.g., green) is
displayed during a phase.
4. What is a traffic cycle or cycle length?
A. Time to install a signal
B. Total elapsed time from the start of a display until it reappears
C. Duration of a single phase
D. Time for vehicle detection
, Answer: Total elapsed time from the start of a display until it reappears
Rationale: Cycle length is the time from the start of a green display until it begins again
after completing all phases.
5. The green interval includes which components? (Select all that apply)
A. Minimum green
B. Passage time
C. Maximum green
D. Red clearance
E. Yellow change
Answer: Minimum green, Passage time, Maximum green
Rationale: The green interval comprises minimum green, passage time, and maximum
green to manage vehicle flow.
6. Which phases are typically assigned to major street through movements?
A. 1 and 5
B. 2 and 6
C. 3 and 7
D. 4 and 8
Answer: 2 and 6
Rationale: Phases 2 and 6 are standard for major street through movements per NEMA
standards.
7. What is the purpose of the yellow change interval?
A. Extend green time
B. Warn drivers to stop safely
C. Clear the intersection
D. Initiate pedestrian crossing
Answer: Warn drivers to stop safely
Rationale: The yellow interval alerts drivers to prepare to stop before the red phase.
8. What is the function of the red clearance interval?
A. Allow pedestrians to cross
B. Clear vehicles from the intersection
C. Extend green time
D. Signal emergency vehicles
Answer: Clear vehicles from the intersection
Rationale: Red clearance ensures all vehicles exit the intersection before opposing
movements begin.
9. Which recall feature returns a phase to green when no demand exists?
A. Maximum recall
, B. Minimum recall
C. Pedestrian recall
D. Soft recall
Answer: Soft recall
Rationale: Soft recall returns a phase to green in the absence of conflicting demand,
unlike other recall types.
10. What is the typical duration for a yellow change interval per MUTCD?
A. 1–2 seconds
B. 3–6 seconds
C. 6–9 seconds
D. 10–12 seconds
Answer: 3–6 seconds
Rationale: MUTCD recommends 3–6 seconds for yellow intervals based on approach
speed.
11. What does the acronym CMS stand for?
A. Controller Monitoring System
B. Changeable Message Sign
C. Circuit Management Switch
D. Central Maintenance Software
Answer: Changeable Message Sign
Rationale: CMS (also VMS or DMS) displays real-time traffic information.
12. What is the purpose of a Changeable Message Sign (CMS)?
A. Control signal timing
B. Provide real-time traffic information
C. Monitor controller health
D. Detect vehicle presence
Answer: Provide real-time traffic information
Rationale: CMS informs drivers about traffic conditions to improve flow.
13. What is a beacon in traffic signal systems?
A. A vehicle detector
B. A flashing signal for warnings
C. A controller component
D. A pedestrian pushbutton
Answer: A flashing signal for warnings
Rationale: Beacons are flashing lights used for warnings, such as at crossings.
Questions and Verified Answers | Grade A
| 100% Correct (2025/ 2026 Update)
Section 1: Traffic Signal Phasing and Timing (Questions 1–
20)
1. An intersection with four through phases and four left turn phases is considered
how many phases together?
A. Four
B. Six
C. Eight
D. Ten
Answer: Eight
Rationale: An intersection with four through phases and four left turn phases totals eight
phases, as each phase represents a specific movement.
2. Each phase is comprised of intervals. True or false?
A. True
B. False
Answer: True
Rationale: Each phase consists of intervals (e.g., green, yellow, red) that control signal
timing.
3. An interval is based on:
A. The number of vehicles
B. The amount of time assigned to a specific display
C. The type of controller used
D. The weather conditions
Answer: The amount of time assigned to a specific display
Rationale: An interval is the duration a specific signal indication (e.g., green) is
displayed during a phase.
4. What is a traffic cycle or cycle length?
A. Time to install a signal
B. Total elapsed time from the start of a display until it reappears
C. Duration of a single phase
D. Time for vehicle detection
, Answer: Total elapsed time from the start of a display until it reappears
Rationale: Cycle length is the time from the start of a green display until it begins again
after completing all phases.
5. The green interval includes which components? (Select all that apply)
A. Minimum green
B. Passage time
C. Maximum green
D. Red clearance
E. Yellow change
Answer: Minimum green, Passage time, Maximum green
Rationale: The green interval comprises minimum green, passage time, and maximum
green to manage vehicle flow.
6. Which phases are typically assigned to major street through movements?
A. 1 and 5
B. 2 and 6
C. 3 and 7
D. 4 and 8
Answer: 2 and 6
Rationale: Phases 2 and 6 are standard for major street through movements per NEMA
standards.
7. What is the purpose of the yellow change interval?
A. Extend green time
B. Warn drivers to stop safely
C. Clear the intersection
D. Initiate pedestrian crossing
Answer: Warn drivers to stop safely
Rationale: The yellow interval alerts drivers to prepare to stop before the red phase.
8. What is the function of the red clearance interval?
A. Allow pedestrians to cross
B. Clear vehicles from the intersection
C. Extend green time
D. Signal emergency vehicles
Answer: Clear vehicles from the intersection
Rationale: Red clearance ensures all vehicles exit the intersection before opposing
movements begin.
9. Which recall feature returns a phase to green when no demand exists?
A. Maximum recall
, B. Minimum recall
C. Pedestrian recall
D. Soft recall
Answer: Soft recall
Rationale: Soft recall returns a phase to green in the absence of conflicting demand,
unlike other recall types.
10. What is the typical duration for a yellow change interval per MUTCD?
A. 1–2 seconds
B. 3–6 seconds
C. 6–9 seconds
D. 10–12 seconds
Answer: 3–6 seconds
Rationale: MUTCD recommends 3–6 seconds for yellow intervals based on approach
speed.
11. What does the acronym CMS stand for?
A. Controller Monitoring System
B. Changeable Message Sign
C. Circuit Management Switch
D. Central Maintenance Software
Answer: Changeable Message Sign
Rationale: CMS (also VMS or DMS) displays real-time traffic information.
12. What is the purpose of a Changeable Message Sign (CMS)?
A. Control signal timing
B. Provide real-time traffic information
C. Monitor controller health
D. Detect vehicle presence
Answer: Provide real-time traffic information
Rationale: CMS informs drivers about traffic conditions to improve flow.
13. What is a beacon in traffic signal systems?
A. A vehicle detector
B. A flashing signal for warnings
C. A controller component
D. A pedestrian pushbutton
Answer: A flashing signal for warnings
Rationale: Beacons are flashing lights used for warnings, such as at crossings.
