This model indicated that minimal headway is quadratic function of the following vehicle speed as the following vehicle speed reduces; rear-end collision will happen, when actual headway is less than certain value.

• 追尾模型表明：最小车头距离是后车速度的二次函数，随后车速度急剧缩小；当实际车头距离小于该值时，则会发生追尾事件。