You are driving a 40-foot vehicle at 35 mph. The road is dry and visibility is good. What is the least amount of space that you should keep in front of your vehicle?

4 seconds. Section 2.7: The formula is 1 second for every 10 feet of vehicle length at speeds below 40 mph. 40 ft / 10 = 4 seconds.

You are driving a 40-foot vehicle at 35 mph. The road is dry and visibility is good. What is the least amount of space that you should keep in front of your vehicle?

ANSWER BREAKDOWN
  • A. Incorrect. 3 seconds is too short. The correct following distance is 4 seconds. The formula is 1 second for every 10 feet of vehicle length at speeds below 40 mph. 40 ft / 10 = 4 seconds.
  • B. Correct. The formula is 1 second for every 10 feet of vehicle length at speeds below 40 mph. 40 ft / 10 = 4 seconds.
  • C. Incorrect. 5 seconds is more than necessary. The correct following distance is 4 seconds. The formula is 1 second for every 10 feet of vehicle length at speeds below 40 mph. 40 ft / 10 = 4 seconds.
  • D. Incorrect. 6 seconds is more than necessary. The correct following distance is 4 seconds. The formula is 1 second for every 10 feet of vehicle length at speeds below 40 mph. 40 ft / 10 = 4 seconds.