The speed of the car is 100km, but there are some people who are driving a distance of 10m. This is not safe for Cars. It must be observed. The distance from the car ahead. After the accident ... dies in front of a car driver. This is murder. This is a bad driving habits.
Shall keep safe distance between cars it means. During the operation who discovered the problem. The driver is found a problem. The driver step on the brakes. This also flows time during that decision. But car slips while. Time goes after operating the brake. If that 100km.... 77m after the last car stops.
77m is the distance needed to stop. You also need time to step on the brake end command to the accident. The accident that occurred during. therefore... Not safe distance is murder.