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(CA) California Traffic Engineer License Exam | Latest
Verified Questions and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the California Traffic
Engineer License Exam. The questions are strategically crafted to cover the core knowledge
domains specified in the exam blueprint, including Traffic Signals and Lighting, Geometric
Design, Traffic Operations and Safety, Traffic Controls, Parking and Circulation, and
Multimodal Facilities. Each question is presented with a single correct answer and a concise
expert rationale, drawing from key references such as the California MUTCD, HCM, AASHTO
Green Book, and Caltrans standards.
Traffic Signals and Lighting
QUESTION 1
A traffic signal is being considered for an intersection that currently has minor cross-
street volumes. According to the CA MUTCD, what is the primary purpose of a signal
warrant?
A) To mandate signal installation at all intersections with high speeds
B) To justify that a traffic signal is necessary based on minimum conditions
C) To determine the optimal cycle length for an existing signal
D) To calculate the number of left-turn phases required
CORRECT ANSWER: B
EXPERT RATIONALE: Warrants are guidelines that define the minimum conditions
under which signal installation may be justified to improve safety and traffic flow .
QUESTION 2
For a signalized intersection with a cycle length of 90 seconds and 4 seconds of total
lost time per phase, what is the total lost time per cycle if it operates with two phases?
A) 4 seconds
B) 8 seconds
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C) 12 seconds
D) 16 seconds
CORRECT ANSWER: B
EXPERT RATIONALE: Total lost time per cycle is the sum of lost time for each phase;
with two phases at 4 seconds each, the total is 8 seconds.
QUESTION 3
The minimum yellow change interval for a 45 mph approach is most nearly:
A) 3.0 seconds
B) 3.5 seconds
C) 4.5 seconds
D) 5.5 seconds
CORRECT ANSWER: C
EXPERT RATIONALE: Yellow intervals are based on approach speed; for 45 mph, the
typical minimum is 4.5 seconds to allow a safe stopping distance .
QUESTION 4
Which of the following is NOT a standard traffic signal warrant in the MUTCD?
A) Eight-hour vehicular volume
B) Pedestrian four-hour volume
C) Peak hour delay
D) Right-turn-on-red volume
CORRECT ANSWER: D
EXPERT RATIONALE: Right-turn-on-red volume is not a signal warrant; warrants
include volume, pedestrian volume, school crossing, and crash experience, among
others.
QUESTION 5
A pretimed signal has a cycle length of 120 seconds. If the total green time allocated to
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all phases is 108 seconds, what is the total lost time per cycle?
A) 4 seconds
B) 8 seconds
C) 12 seconds
D) 24 seconds
CORRECT ANSWER: C
EXPERT RATIONALE: Total lost time equals cycle length minus total effective green
time; 120 - 108 = 12 seconds.
QUESTION 6
Signal coordination along a corridor aims primarily to:
A) Reduce the number of signalized intersections
B) Allow platoons of vehicles to travel through multiple intersections without stopping
C) Increase the cycle length at each intersection independently
D) Minimize pedestrian crossing times
CORRECT ANSWER: B
EXPERT RATIONALE: Coordination, or progression, allows vehicles traveling at the
design speed to encounter green lights at successive intersections, reducing delay and
stops.
QUESTION 7
The "85th percentile speed" is most commonly used to:
A) Determine the minimum yellow interval
B) Establish posted speed limits
C) Calculate signal cycle lengths
D) Set pedestrian walk speeds
CORRECT ANSWER: B
EXPERT RATIONALE: The 85th percentile speed is the speed at or below which 85% of
free-flowing vehicles travel and is a standard guideline for setting speed limits .
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QUESTION 8
A vehicle arrives at a signalized intersection 10 seconds after the start of red. The
cycle length is 80 seconds with a 40-second green indication. If the vehicle
experiences no initial queue, what is its control delay?
A) 10 seconds
B) 30 seconds
C) 40 seconds
D) 70 seconds
CORRECT ANSWER: B
EXPERT RATIONALE: The vehicle must wait for the remainder of the red interval. It
arrived 10 seconds into red, so it waits 30 more seconds (40 - 10) for the green to
begin.
QUESTION 9
What is the primary function of signal preemption?
A) To extend green time based on real-time demand
B) To temporarily assign right-of-way to a specific vehicle type, such as a train or
emergency vehicle
C) To coordinate signals along a corridor
D) To flash red during off-peak hours
CORRECT ANSWER: B
EXPERT RATIONALE: Preemption interrupts the normal signal operation to provide
green indications to special vehicles, enhancing safety and reducing response times .
QUESTION 10
A loop detector in a left-turn lane fails to detect a vehicle. The most likely immediate
impact on signal operation is:
A) The signal will flash red
B) The left-turn phase may be skipped, causing delay for that movement
(CA) California Traffic Engineer License Exam | Latest
Verified Questions and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the California Traffic
Engineer License Exam. The questions are strategically crafted to cover the core knowledge
domains specified in the exam blueprint, including Traffic Signals and Lighting, Geometric
Design, Traffic Operations and Safety, Traffic Controls, Parking and Circulation, and
Multimodal Facilities. Each question is presented with a single correct answer and a concise
expert rationale, drawing from key references such as the California MUTCD, HCM, AASHTO
Green Book, and Caltrans standards.
Traffic Signals and Lighting
QUESTION 1
A traffic signal is being considered for an intersection that currently has minor cross-
street volumes. According to the CA MUTCD, what is the primary purpose of a signal
warrant?
A) To mandate signal installation at all intersections with high speeds
B) To justify that a traffic signal is necessary based on minimum conditions
C) To determine the optimal cycle length for an existing signal
D) To calculate the number of left-turn phases required
CORRECT ANSWER: B
EXPERT RATIONALE: Warrants are guidelines that define the minimum conditions
under which signal installation may be justified to improve safety and traffic flow .
QUESTION 2
For a signalized intersection with a cycle length of 90 seconds and 4 seconds of total
lost time per phase, what is the total lost time per cycle if it operates with two phases?
A) 4 seconds
B) 8 seconds
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C) 12 seconds
D) 16 seconds
CORRECT ANSWER: B
EXPERT RATIONALE: Total lost time per cycle is the sum of lost time for each phase;
with two phases at 4 seconds each, the total is 8 seconds.
QUESTION 3
The minimum yellow change interval for a 45 mph approach is most nearly:
A) 3.0 seconds
B) 3.5 seconds
C) 4.5 seconds
D) 5.5 seconds
CORRECT ANSWER: C
EXPERT RATIONALE: Yellow intervals are based on approach speed; for 45 mph, the
typical minimum is 4.5 seconds to allow a safe stopping distance .
QUESTION 4
Which of the following is NOT a standard traffic signal warrant in the MUTCD?
A) Eight-hour vehicular volume
B) Pedestrian four-hour volume
C) Peak hour delay
D) Right-turn-on-red volume
CORRECT ANSWER: D
EXPERT RATIONALE: Right-turn-on-red volume is not a signal warrant; warrants
include volume, pedestrian volume, school crossing, and crash experience, among
others.
QUESTION 5
A pretimed signal has a cycle length of 120 seconds. If the total green time allocated to
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all phases is 108 seconds, what is the total lost time per cycle?
A) 4 seconds
B) 8 seconds
C) 12 seconds
D) 24 seconds
CORRECT ANSWER: C
EXPERT RATIONALE: Total lost time equals cycle length minus total effective green
time; 120 - 108 = 12 seconds.
QUESTION 6
Signal coordination along a corridor aims primarily to:
A) Reduce the number of signalized intersections
B) Allow platoons of vehicles to travel through multiple intersections without stopping
C) Increase the cycle length at each intersection independently
D) Minimize pedestrian crossing times
CORRECT ANSWER: B
EXPERT RATIONALE: Coordination, or progression, allows vehicles traveling at the
design speed to encounter green lights at successive intersections, reducing delay and
stops.
QUESTION 7
The "85th percentile speed" is most commonly used to:
A) Determine the minimum yellow interval
B) Establish posted speed limits
C) Calculate signal cycle lengths
D) Set pedestrian walk speeds
CORRECT ANSWER: B
EXPERT RATIONALE: The 85th percentile speed is the speed at or below which 85% of
free-flowing vehicles travel and is a standard guideline for setting speed limits .
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QUESTION 8
A vehicle arrives at a signalized intersection 10 seconds after the start of red. The
cycle length is 80 seconds with a 40-second green indication. If the vehicle
experiences no initial queue, what is its control delay?
A) 10 seconds
B) 30 seconds
C) 40 seconds
D) 70 seconds
CORRECT ANSWER: B
EXPERT RATIONALE: The vehicle must wait for the remainder of the red interval. It
arrived 10 seconds into red, so it waits 30 more seconds (40 - 10) for the green to
begin.
QUESTION 9
What is the primary function of signal preemption?
A) To extend green time based on real-time demand
B) To temporarily assign right-of-way to a specific vehicle type, such as a train or
emergency vehicle
C) To coordinate signals along a corridor
D) To flash red during off-peak hours
CORRECT ANSWER: B
EXPERT RATIONALE: Preemption interrupts the normal signal operation to provide
green indications to special vehicles, enhancing safety and reducing response times .
QUESTION 10
A loop detector in a left-turn lane fails to detect a vehicle. The most likely immediate
impact on signal operation is:
A) The signal will flash red
B) The left-turn phase may be skipped, causing delay for that movement
