DGT Road Safety & Rules 3 — Questions and Answers
Question 1: Which blood alcohol concentration (BAC) is the legal limit for non-commercial drivers 21 and older in most U.S. states?
- 0.04%
- 0.06%
- 0.08% (Correct answer)
- 0.10%
Correct answer: 0.08%
The per se legal BAC limit for adult non-commercial drivers is 0.08% in most U.S. jurisdictions.
Question 2: When a traffic signal is completely dark (no lights working), the intersection should be treated as:
- A yield intersection
- A two-way stop
- An all-way stop (Correct answer)
- An uncontrolled intersection where the larger road has priority
Correct answer: An all-way stop
A non-functioning traffic signal requires all drivers to stop and treat the intersection as a four-way stop.
Question 3: What is the purpose of rumble strips on highway shoulders?
- Indicate the speed limit zone
- Alert drowsy or distracted drivers they are leaving the travel lane (Correct answer)
- Mark bicycle lane boundaries
- Provide traction for stopping vehicles
Correct answer: Alert drowsy or distracted drivers they are leaving the travel lane
Rumble strips create noise and vibration that alert drivers when their vehicle drifts onto the shoulder.
Question 4: At a roundabout, vehicles already in the circle have:
- No special priority
- Priority only if going straight
- The right-of-way over entering traffic (Correct answer)
- Priority only during peak hours
Correct answer: The right-of-way over entering traffic
Traffic inside a roundabout always has the right-of-way; entering drivers must yield before merging.
Question 5: What does a flashing yellow traffic light mean?
- Stop completely before proceeding
- The light is about to turn red
- Proceed with caution (Correct answer)
- Yield to all cross traffic
Correct answer: Proceed with caution
A flashing yellow signal warns drivers to slow down and proceed through the intersection with caution.
Question 6: How far from a fire hydrant must you park to keep access clear?
- 5 feet
- 10 feet
- 15 feet (Correct answer)
- 25 feet
Correct answer: 15 feet
Federal and most state guidelines require parking at least 15 feet from a fire hydrant to ensure emergency access.
Question 7: Which of the following statements about driving in work zones is correct?
- Speed limits are advisory and may be ignored when workers are absent
- Fines for traffic violations are typically doubled in work zones (Correct answer)
- Drivers may pass stopped traffic in a work zone using the shoulder
- Work zone speed limits apply only during daylight hours
Correct answer: Fines for traffic violations are typically doubled in work zones
Most states double fines for traffic violations in designated work zones to protect road workers.
DGT Road Safety & Rules 3
Which blood alcohol concentration (BAC) is the legal limit for non-commercial drivers 21 and older in most U.S. states?