Whenever you pause in traffic, there should be a minimum of three seconds of distance between the vehicle front of you and your vehicle.
When you notice an accident on the street ahead, it will take you about 1.5 seconds to react. Then, a typical car needs 1.5 seconds to brake. That means you should keep at most nominal 3 seconds of distance between you and any vehicle in front of you, and maybe more depending on driving needs.
The rule of thumb, suggested by the National Safety Council, is that there should be a three-second following space between two vehicles since three seconds is believed enough time for any driver to sense a potential hazard on the road ahead and react therefore to avoid it.
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