CDT Traffic Laws & Regulations 2 — Questions and Answers
Question 1: Under federal Hours of Service regulations, what is the maximum number of hours a property-carrying CMV driver may drive after 10 consecutive hours off duty?
- 8 hours
- 10 hours
- 11 hours (Correct answer)
- 14 hours
Correct answer: 11 hours
FMCSA property-carrying drivers may drive up to 11 hours after taking 10 consecutive hours off duty.
Question 2: Which agency establishes the Federal Motor Carrier Safety Regulations (FMCSRs) that CDT candidates must know?
- National Highway Traffic Safety Administration (NHTSA)
- Federal Motor Carrier Safety Administration (FMCSA) (Correct answer)
- Department of Transportation Office of Inspector General
- Commercial Vehicle Safety Alliance (CVSA)
Correct answer: Federal Motor Carrier Safety Administration (FMCSA)
The FMCSA, a division of the U.S. DOT, issues and enforces the FMCSRs governing commercial motor vehicle operations.
Question 3: A driver trainer observes a student make an improper left turn at a controlled intersection. Which regulation governs required left-turn positioning?
- Drivers must approach from the rightmost lane available
- Drivers must approach from the lane nearest the center of the road (Correct answer)
- Drivers may approach from any lane if the path is clear
- Drivers must approach from the shoulder to maximize visibility
Correct answer: Drivers must approach from the lane nearest the center of the road
Uniform Vehicle Code and state laws require left turns to be made from the lane nearest and to the right of the centerline.
Question 4: When a school bus displays flashing red lights and its stop arm is extended on a two-lane undivided road, traffic in BOTH directions must:
- Slow to 15 mph and proceed cautiously
- Stop and remain stopped until the lights are off and arm retracted (Correct answer)
- Yield only if children are visible
- Stop only if traveling in the same direction as the bus
Correct answer: Stop and remain stopped until the lights are off and arm retracted
On an undivided two-lane road, all approaching vehicles from either direction must stop when a school bus activates its red signals and stop arm.
Question 5: What blood alcohol concentration (BAC) level is the per se legal limit for commercial motor vehicle drivers under federal law?
- 0.08%
- 0.06%
- 0.04% (Correct answer)
- 0.02%
Correct answer: 0.04%
Federal law (49 CFR 382.201) sets a 0.04% BAC per se limit for CDL holders operating CMVs, half the standard limit.
Question 6: Which of the following is considered a 'serious traffic violation' that can lead to CDL disqualification under FMCSA rules?
- Failure to use a turn signal on a rural road
- Speeding 15 mph or more above the posted limit (Correct answer)
- Rolling through a stop sign at 5 mph
- Parking in a no-parking zone
Correct answer: Speeding 15 mph or more above the posted limit
Speeding 15 mph or more over the posted limit is a serious traffic violation under 49 CFR 383.51 that triggers CDL disqualification upon multiple offenses.
Question 7: A driver trainer is teaching a student about right-of-way at an uncontrolled intersection. Which vehicle has the right-of-way?
- The vehicle that entered the intersection first
- The vehicle traveling at a higher speed
- The vehicle on the left always yields to the vehicle on the right (Correct answer)
- The larger vehicle always has the right-of-way
Correct answer: The vehicle on the left always yields to the vehicle on the right
At uncontrolled intersections, the vehicle on the left must yield to the vehicle approaching from the right.
CDT Traffic Laws & Regulations 2
Under federal Hours of Service regulations, what is the maximum number of hours a property-carrying CMV driver may drive after 10 consecutive hours off duty?