Picture yourself driving the blue car behind the red one. What is the minimum gap you should keep?
Correct answer: One car length per 10 mph, or a 3-second gap.
Answer options
AHalf a car length per 10 mph, or a 1.5-second gap
BOne car length per 10 mph, or a 3-second gap Correct
COne car length per 20 mph, or a 1-second gap
Why
A widely taught guideline is to stay at least one car length back for every 10 mph, or to keep a 3-second gap: when the car ahead passes a fixed point, you should be able to count three seconds before you reach it. The other choices leave much less space than either measure calls for.