If you are driving a 40-foot vehicle at 50 mph, how much following distance is required?

5 seconds. Section 2.7: Formula: 1 sec per 10 feet (4 seconds) + 1 second for speed over 40 mph = 5 seconds.

If you are driving a 40-foot vehicle at 50 mph, how much following distance is required?

ANSWER BREAKDOWN
  • A. Incorrect. 4 seconds is too short. The correct following distance is 5 seconds. Formula: 1 sec per 10 feet (4 seconds) + 1 second for speed over 40 mph = 5 seconds.
  • B. Correct. Formula: 1 sec per 10 feet (4 seconds) + 1 second for speed over 40 mph = 5 seconds.
  • C. Incorrect. 6 seconds is more than necessary. The correct following distance is 5 seconds. Formula: 1 sec per 10 feet (4 seconds) + 1 second for speed over 40 mph = 5 seconds.
  • D. Incorrect. 7 seconds is more than necessary. The correct following distance is 5 seconds. Formula: 1 sec per 10 feet (4 seconds) + 1 second for speed over 40 mph = 5 seconds.