基于元胞自动机的高速公路货车结伴行为研究

为了研究高速公路货车结伴行为，本文建立了一种适应于结伴货车车队的双 车道元胞自动机模型.分析了高速公路货车结伴特性及其对道路交通流的整体影响.研究 表明，结伴车辆在时空上是一个紧密联系的整体，流量较大时，车头时距分布曲线呈双峰 分布形式.同一流量时，不同长度车队间的平均速度差异较小，车队能保持较理想的速度 平稳行驶.结伴车队的存在激增了普通车辆的换道频率，改变了交通流状态，使基本图出 现明显的中断现象，当车队长度较长时，限制了同步流的产生.所提出模型刻画了高速公 路上货车主动结伴出行行为，为特殊情况下的交通流特性研究提供了参考和借鉴.

Partnering Behavior of Truck Platoon on Freeway Based on Cellular Automaton

To study the partnering behavior of truck platoon on freeway, a new two-lane cellular automaton model for the partnering truck platoon is proposed. It analyzes characteristics of the partnering truck platoon and its impact on traffic flow. The results show that partnering truck platoon is a closely linked entirety, and the distribution curves of headway show the double peak trend when flow is relatively high. Under the same flow, there is little differences of mean speed between different size trucks platoon, the platoons can run steadily at desired speed. The existence of truck platoon enhances the lane changing frequency of usual vehicles, changing the state of traffic, resulting interruptions in fundamental diagram, and limits the emergence of synchronized flow when platoon size is relatively long. The proposed model reproduced the partnering behavior of truck platoon on freeway well, and it can provide reference for study on traffic flow characteristics under special condition.