What is the least amount of space the driver of the blue car should keep behind the red car?
Correct answer: One car length for each 10 mph, or 3 seconds.
Answer options
AOne car length for each 30 mph, or 1 second
BOne car length for each 10 mph, or 3 seconds Correct
COne car length for each 20 mph, or 1.5 seconds
Why
The usual guideline is one car length for every 10 mph or, more simply, a 3-second gap: count from the moment the car ahead passes a landmark until you pass it. The other choices leave much less room than either measure calls for.