When driving at speeds faster than 30 mph, keep a minimum following distance of:
- One second.
- Two seconds.
- Three seconds.
- Four seconds. ✓
Answer: D. Four seconds.
At speeds above 30 mph you should keep a following gap of at least four seconds.
Why this is the answer
The handbook sets the minimum following time by how fast you are going. At 30 mph or less, it calls for at least two seconds in good road conditions. Once you go above 30 mph, it raises that minimum to a four-second gap, and it adds that you should allow even more time when road conditions are poor. It also names the four-second interval as the best habit for a new or less experienced driver, which is exactly the stage you are at now.
Why the other answers are wrong
- A. One second. — One second leaves far less room than the handbook's smallest figure, which is two seconds for the slower speeds.
- B. Two seconds. — Two seconds is the minimum the handbook gives only for speeds of 30 mph or less in good conditions, not for faster driving.
- C. Three seconds. — Three seconds is not a following gap the handbook lists anywhere for this speed range.
Remember it
Think of the speed limit sign as the switch: at or under 30, count two seconds; above 30, count to four.