two-second rule(redirected from Two second rule)
A guideline denoting the distance that a driver should ideally maintain from the back of another car in order to avoid hitting it in the event of a fast stop. While teaching my daughter how to drive, I made sure to emphasize the two-second rule. I've never been in a car accident, and I think it's because I always keep the two-second rule in mind when I drive.
See also: rule