If you are driving a vehicle 45 feet long at 55 mph, how much following distance is required?

5.5 seconds.. Section 2.7: 4.5 seconds (for length) + 1 second (for speed > 40 mph) = 5.5 seconds.

If you are driving a vehicle 45 feet long at 55 mph, how much following distance is required?

ANSWER BREAKDOWN
  • A. Incorrect. 5 seconds is more than necessary. The correct following distance is 5 seconds. 4.5 seconds (for length) + 1 second (for speed > 40 mph) = 5.5 seconds.
  • B. Correct. 4.5 seconds (for length) + 1 second (for speed > 40 mph) = 5.5 seconds.
  • C. Incorrect. 6 seconds is more than necessary. The correct following distance is 5 seconds. 4.5 seconds (for length) + 1 second (for speed > 40 mph) = 5.5 seconds.
  • D. Incorrect. 7 seconds is more than necessary. The correct following distance is 5 seconds. 4.5 seconds (for length) + 1 second (for speed > 40 mph) = 5.5 seconds.