via Reddit

Common sense rules of the road suggest drivers maintain a three-second following distance between themselves and the car ahead of them on a highway. You can calculate this distance by using a fixed object on the road to see if there is enough distance between your car and the motorist in front of you.

As all drivers know, not every one leaves a safe distance between themselves and the car in front of them and this puts both in danger. The tailgater in an especially precarious position because they can't see what's happening ahead of them.

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