> Usual safety guidelines are to stay about 3 car lengths behind whoever you're following Uh, no. Usual safety guidelines are to stay a speed-dependent distanc

> Usual safety guidelines are to stay about 3 car lengths behind whoever you're following Uh, no. Usual safety guidelines are to stay a speed-dependent distance behind whomever you're following. The one I've heard most often quoted is one car length per ten miles per hour, so at 70mph you should be a minimum of seven car lengths behind. Three lengths is comically short for those kinds of speeds.