The model assumes that every vehicle tends to keep expected time-headway and each vehicle synchronously updates its velocity by estimating the velocity of the head vehicle, the distance headway and the probability of random slowdown.

• 该模型假定行驶车辆都趋向于保持一个期望的车头时距，通过对前车速度和车头间距的估计，并考虑随机减速的影响对车速进行同步更新。