Safety distance about car-following

It is pointed out that the traffic accident mostly result in improper driver's action. The driver's capability of response time and speed estimation are studied, and driving performance by car following in traffic is investigated, in order to calculate the appropriate driving safety distance, which assures that neither the rear end collision occurs nor road capacity is affected. If the following distance is S (m), and the following vehicle's velocity is V (m/s), the study results show that when S > V/2, the following is safety under the good condition of driver and vehicle, when S > 2V, the following is safety under the poor operation of driver and vehicle.