CALIFORNIA TRAFFILE ENGINEER EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
- Traffic Operations and Analysis
- Roadway Geometric Design
- Traffic Control Devices (MUTCD Compliance)
- California Vehicle Code and Legal Framework
- Safety and Accident Analysis
- Signal Systems and Timing
- Work Zone Traffic Control
- Intelligent Transportation Systems (ITS)
- Environmental and Community Impacts
- Ethics and Professional Responsibility
Introduction
*This assessment is designed to evaluate candidates for the California Traffic Engineer Exam. It measures
foundational theory, applied professional knowledge, regulatory compliance, ethics, and real-world decision-
making essential for safe and efficient traffic systems. The exam includes 200 multiple-choice questions across
two sections, combining technical scenarios and critical thinking exercises. Each question is followed by a
verified correct answer and a clear rationale. Emphasis is placed on California-specific standards, the MUTCD,
and the California Vehicle Code. Successful candidates demonstrate both analytical rigor and practical judgment
in traffic engineering contexts.*
,SECTION ONE: QUESTIONS 1–100
Question 1
According to the MUTCD, what is the minimum required letter height for a street name sign on a roadway with
a posted speed limit of 40 mph?
A. 6 inches
B. 8 inches
C. 10 inches
D. 4 inches
🟢B
🔴 RATIONALE: MUTCD Table 2B-1 specifies 8-inch letter height for street name signs on roadways with speed
limits between 40 and 45 mph, increasing to 10 inches for 50 mph or higher.
Question 2
A traffic engineer is reviewing a signalized intersection with a cycle length of 90 seconds. If the total lost time
per cycle is 12 seconds, what is the total effective green time available for all phases?
A. 78 seconds
B. 90 seconds
C. 102 seconds
D. 66 seconds
🟢A
,🔴 RATIONALE: Effective green time = cycle length minus total lost time. 90 – 12 = 78 seconds. This is a
standard signal timing calculation.
Question 3
Under the California Vehicle Code, a driver making a right turn at a red light must:
A. Stop only if a pedestrian is present
B. Come to a complete stop before entering the crosswalk
C. Slow down and yield to cross traffic
D. Stop only if a “No Turn on Red” sign is posted
🟢B
🔴 RATIONALE: CVC 21453(b) requires a complete stop before entering the crosswalk or limit line when turning
right on red, regardless of pedestrian presence.
Question 4
Which traffic signal phasing type is most appropriate for an intersection with a high volume of left-turn
movements that conflict with opposing through traffic?
A. Protected only
B. Permissive only
C. Protected-permissive
D. Split phasing
🟢A
, 🔴 RATIONALE: Protected-only left-turn phasing eliminates conflicts by giving left-turning vehicles an exclusive
green arrow, essential for high-volume conflicting movements.
Question 5
A traffic engineer observes 10 crashes at an intersection over 2 years. The total entering AADT is 15,000 vehicles.
What is the crash rate per million entering vehicles?
A. 0.91
B. 1.21
C. 0.67
D. 1.83
🟢A
🔴 RATIONALE: Crash rate = (crashes × 1,000,000) / (AADT × 365 × years) = (10 × 1e6) / (15000 × 365 × 2) =
10e.95e6 = 0.913.
Question 6
When designing a horizontal curve on a California state highway with a design speed of 50 mph, the minimum
radius (assuming superelevation of 6% and side friction factor of 0.14) is closest to:
A. 450 ft
B. 650 ft
C. 850 ft
D. 1050 ft
🟢B
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
- Traffic Operations and Analysis
- Roadway Geometric Design
- Traffic Control Devices (MUTCD Compliance)
- California Vehicle Code and Legal Framework
- Safety and Accident Analysis
- Signal Systems and Timing
- Work Zone Traffic Control
- Intelligent Transportation Systems (ITS)
- Environmental and Community Impacts
- Ethics and Professional Responsibility
Introduction
*This assessment is designed to evaluate candidates for the California Traffic Engineer Exam. It measures
foundational theory, applied professional knowledge, regulatory compliance, ethics, and real-world decision-
making essential for safe and efficient traffic systems. The exam includes 200 multiple-choice questions across
two sections, combining technical scenarios and critical thinking exercises. Each question is followed by a
verified correct answer and a clear rationale. Emphasis is placed on California-specific standards, the MUTCD,
and the California Vehicle Code. Successful candidates demonstrate both analytical rigor and practical judgment
in traffic engineering contexts.*
,SECTION ONE: QUESTIONS 1–100
Question 1
According to the MUTCD, what is the minimum required letter height for a street name sign on a roadway with
a posted speed limit of 40 mph?
A. 6 inches
B. 8 inches
C. 10 inches
D. 4 inches
🟢B
🔴 RATIONALE: MUTCD Table 2B-1 specifies 8-inch letter height for street name signs on roadways with speed
limits between 40 and 45 mph, increasing to 10 inches for 50 mph or higher.
Question 2
A traffic engineer is reviewing a signalized intersection with a cycle length of 90 seconds. If the total lost time
per cycle is 12 seconds, what is the total effective green time available for all phases?
A. 78 seconds
B. 90 seconds
C. 102 seconds
D. 66 seconds
🟢A
,🔴 RATIONALE: Effective green time = cycle length minus total lost time. 90 – 12 = 78 seconds. This is a
standard signal timing calculation.
Question 3
Under the California Vehicle Code, a driver making a right turn at a red light must:
A. Stop only if a pedestrian is present
B. Come to a complete stop before entering the crosswalk
C. Slow down and yield to cross traffic
D. Stop only if a “No Turn on Red” sign is posted
🟢B
🔴 RATIONALE: CVC 21453(b) requires a complete stop before entering the crosswalk or limit line when turning
right on red, regardless of pedestrian presence.
Question 4
Which traffic signal phasing type is most appropriate for an intersection with a high volume of left-turn
movements that conflict with opposing through traffic?
A. Protected only
B. Permissive only
C. Protected-permissive
D. Split phasing
🟢A
, 🔴 RATIONALE: Protected-only left-turn phasing eliminates conflicts by giving left-turning vehicles an exclusive
green arrow, essential for high-volume conflicting movements.
Question 5
A traffic engineer observes 10 crashes at an intersection over 2 years. The total entering AADT is 15,000 vehicles.
What is the crash rate per million entering vehicles?
A. 0.91
B. 1.21
C. 0.67
D. 1.83
🟢A
🔴 RATIONALE: Crash rate = (crashes × 1,000,000) / (AADT × 365 × years) = (10 × 1e6) / (15000 × 365 × 2) =
10e.95e6 = 0.913.
Question 6
When designing a horizontal curve on a California state highway with a design speed of 50 mph, the minimum
radius (assuming superelevation of 6% and side friction factor of 0.14) is closest to:
A. 450 ft
B. 650 ft
C. 850 ft
D. 1050 ft
🟢B
