Most experts recommend a 3 second following distance between you and the vehicle in front of you if you are driving a passenger car or light truck in ideal conditions. That distance should be increased when driving under poor conditions, driving at night, or if you are operating a large semi truck. This distance will not only help you stop in time in case of a crash ahead of you, it also means you don’t have to slam on your brakes and may prevent those behind you from crashing into your car.