If you are driving a 50-foot truck at 50 mph, how many seconds of following distance should you keep?

6 seconds.. Section 2.7: Formula: 1 second per 10 feet (5 seconds) + 1 second for speed over 40 mph = 6 seconds.

If you are driving a 50-foot truck at 50 mph, how many seconds of following distance should you keep?

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