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中文摘要：
提出一种改进的单车道混合车辆元胞自动机交通流模型，考虑了车间距、车速对随机延迟概率的影响：当车速预期大于车间距时，其延迟概率较大；当车速预期等于车间距时，其相应的延迟概率较小；当车速预期小于车间距时，其具有的延迟概率最小．按此模型，通过计算机数值模拟，研究了具有不同最大行驶速度、不同随机延迟概率的车辆组成的混合交通流，得到的基本图在自由流区域出现跳变现象，在拥堵区域出现两个流量峰值，表明这是一种同步交通流现象．
英文摘要：
We present a improved mixed cellular automaton traffic flow model on single--lane roadway by considering the effects of the gap between the successive cars and the velocity on the stochastic delay probability. So the delay probability can be classified into three cases： at the first case the car has a large delay probability while its anticipant velocity is larger than the gap between it and the front car, at the second case the car has a intermediate delay probability if the anticipant velocity is equal to the gap, at the third case the car has minimum delay probability while the anticipant velocity is smaller than the gap. According to this model, the traffic flow mixed with different maximum velocity and different stochastic delay probability can be studied by numerical simulation. A discontinuous first order phase transition can be found in the fundamental diagram when the slow car appears and there are two peaks of flow in the congestion regions. It confirms that the flow in the saddle shape is synchronization flow.
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