Picture yourself driving the blue car behind the red one. At a minimum, how much following distance should you keep?
Correct answer: 3 seconds, or a car length for every 10 mph.
Answer options
AHalf a second, or a car length at any speed
B1 second, or a car length for every 25 mph
C3 seconds, or a car length for every 10 mph Correct
Why
To test the gap, choose a fixed object such as a sign: once the red car passes it, the blue car should need at least three seconds to get there. One second or less is far too close, and rain, darkness or heavy traffic call for more room.
