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[vwtech]

never heard of the 2 car length rule I always thought it was 3 seconds behind no matter how fast they are going.

[Kal-El]

Originally Posted by vwtech

never heard of the 2 car length rule I always thought it was 3 seconds behind no matter how fast they are going.

The common rule of thumb, and the one taught in driving schools, is one car length for every 10mph to allow proper stopping time if the car in front suddenly jams on their brakes or hits something.

So on the highway, that means a good 6 car lengths. Naturally, most people don't follow this especially in the left lane.