Traffic Engineering Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the primary purpose of traffic engineering?
A. Increase vehicle speed
B. Improve safety and efficiency of transportation systems
C. Reduce fuel consumption only
D. Eliminate traffic laws
Answer: Improve safety and efficiency of transportation systems
Rationale: Traffic engineering focuses on optimizing safety, mobility, and
efficiency for all road users.
2. Which study measures traffic volume over time?
A. Speed study
B. Origin-destination study
C. Volume study
D. Parking study
Answer: Volume study
Rationale: Volume studies quantify the number of vehicles passing a point
during a given time.
,3. What does AADT stand for?
A. Annual Average Daily Traffic
B. Average Annual Driving Time
C. Adjusted Average Daily Travel
D. Annual Average Density Traffic
Answer: Annual Average Daily Traffic
Rationale: AADT represents the average number of vehicles per day over a
year.
4. Which device is used to measure vehicle speed?
A. Loop detector
B. Radar gun
C. Pneumatic tube
D. Signal controller
Answer: Radar gun
Rationale: Radar guns measure speed using Doppler radar technology.
5. What is the peak hour factor (PHF)?
A. Ratio of peak hour volume to daily volume
B. Ratio of hourly volume to maximum flow rate
C. Measure of traffic congestion
D. Ratio of peak 15-minute flow to hourly flow
Answer: Ratio of hourly volume to maximum flow rate
Rationale: PHF reflects variation in traffic flow within the peak hour.
6. Which traffic flow parameter relates flow, speed, and density?
A. Greenshields model
B. Shockwave theory
C. Webster’s formula
D. Highway capacity manual
, Answer: Greenshields model
Rationale: Greenshields established a fundamental relationship among
speed, flow, and density.
7. What is LOS in traffic engineering?
A. Level of Safety
B. Level of Service
C. Limit of Speed
D. Length of Section
Answer: Level of Service
Rationale: LOS grades traffic conditions from A (free flow) to F
(congested).
8. Which LOS indicates free-flow conditions?
A. A
B. C
C. E
D. F
Answer: A
Rationale: LOS A represents minimal delay and maximum comfort.
9. What is traffic density?
A. Vehicles per hour
B. Vehicles per kilometer
C. Speed per vehicle
D. Travel time per mile
Answer: Vehicles per kilometer
Rationale: Density is the number of vehicles occupying a unit length of
roadway.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the primary purpose of traffic engineering?
A. Increase vehicle speed
B. Improve safety and efficiency of transportation systems
C. Reduce fuel consumption only
D. Eliminate traffic laws
Answer: Improve safety and efficiency of transportation systems
Rationale: Traffic engineering focuses on optimizing safety, mobility, and
efficiency for all road users.
2. Which study measures traffic volume over time?
A. Speed study
B. Origin-destination study
C. Volume study
D. Parking study
Answer: Volume study
Rationale: Volume studies quantify the number of vehicles passing a point
during a given time.
,3. What does AADT stand for?
A. Annual Average Daily Traffic
B. Average Annual Driving Time
C. Adjusted Average Daily Travel
D. Annual Average Density Traffic
Answer: Annual Average Daily Traffic
Rationale: AADT represents the average number of vehicles per day over a
year.
4. Which device is used to measure vehicle speed?
A. Loop detector
B. Radar gun
C. Pneumatic tube
D. Signal controller
Answer: Radar gun
Rationale: Radar guns measure speed using Doppler radar technology.
5. What is the peak hour factor (PHF)?
A. Ratio of peak hour volume to daily volume
B. Ratio of hourly volume to maximum flow rate
C. Measure of traffic congestion
D. Ratio of peak 15-minute flow to hourly flow
Answer: Ratio of hourly volume to maximum flow rate
Rationale: PHF reflects variation in traffic flow within the peak hour.
6. Which traffic flow parameter relates flow, speed, and density?
A. Greenshields model
B. Shockwave theory
C. Webster’s formula
D. Highway capacity manual
, Answer: Greenshields model
Rationale: Greenshields established a fundamental relationship among
speed, flow, and density.
7. What is LOS in traffic engineering?
A. Level of Safety
B. Level of Service
C. Limit of Speed
D. Length of Section
Answer: Level of Service
Rationale: LOS grades traffic conditions from A (free flow) to F
(congested).
8. Which LOS indicates free-flow conditions?
A. A
B. C
C. E
D. F
Answer: A
Rationale: LOS A represents minimal delay and maximum comfort.
9. What is traffic density?
A. Vehicles per hour
B. Vehicles per kilometer
C. Speed per vehicle
D. Travel time per mile
Answer: Vehicles per kilometer
Rationale: Density is the number of vehicles occupying a unit length of
roadway.
