> If the car in front of you hits something and comes to an extremely abrupt stop and you don't have the stopping distance to stop, you're too close. It is phy

> If the car in front of you hits something and comes to an extremely abrupt stop and you don't have the stopping distance to stop, you're too close. It is physically impossible for a car to come to an instantaneous stop for no reason. It would have to e.g. drive into a concrete wall, but if there's a wall across the freeway you should've seen that from afar. You only really need to have enough distance to be able to notice the car ahead braking and start braking yourself.