Abstract: When controlling the signal of highway-rail level crossings in the port area, the multi-objective signal optimization model is not applicable due to the cross effect of roads and railways and the priority of incoming vehicles. Therefore, in order to ensure that the inbound truck fleet enters the port directly without being affected by the train when passing through the highway-rail level crossing in the port area, the queuing of vehicles in front of the port needs to be reduced, and the priority should be given to the inbound trucks. Based on the idea of priority on key lanes, this study relies on speed guidance information to guide the fleet to shift reasonably, postpone or early arrive at the railway gate. At the same time, the optimization goal is to minimize the delays at intersections, the number of stops, and the vehicle exhaust emissions. The measured data of road-rail level crossings in Dayaowan Port Area of Dalian were selected, and it was re-developed under the VISSIM environment by serial interface to realize signal optimization control under vehicle speed guidance. The original timing plan, multi-objective timing optimization plan and key lanes priority are given to the optimization scheme for simulation experiments. The results show that the multi-objective optimization scheme and the optimization scheme under the priority of key lanes can generally improve the traffic capacity of road-rail level crossings. Compared with the original plan, the optimization plan under the priority of key lanes reduces the delay by 33.3%, the number of stops is reduced by 25%, and the vehicle exhaust emissions are reduced by 31.3%. It proves the effectiveness of the optimization scheme for highway-rail level crossings in the port area under the priority of key lanes, and it is more suitable for highway-rail level crossings.

Key words: traffic engineering, multi-objective optimization, critical lane, highway-railway level-crossing, speed guidance

摘要： 为保障进港集卡车队在港区经过公铁平交道口时不受列车的影响直接进入港口，减少车辆在港口前的排队，赋予进港集卡优先通行权。基于关键车道优先思想，依靠车速引导信息引导车队合理变速，推迟或提前到达铁道闸口，同时以交叉口延误、排队长度以及停车次数最小为优化目标，重新优化港区公铁平交道口信号配时方案。选取大连市大窑湾港区公铁平交道口实测数据，在VISSIM环境下对COM进行二次开发实现了车速引导下的信号优化控制，对原配时方案、多目标配时优化方案以及关键车道优先下的优化方案进行仿真实验。结果表明：多目标优化方案和关键车道优先下的优化方案总体上均可提高公铁平交道口通行能力。关键车道优先下的多目标优化方案效果更加适应公铁平交道口，较原方案延误降低了33.3%，停车次数降低了25%，车辆尾气排放量降低了31.3%，证明了关键车道优先下的港区公铁平交道口优化方案的有效性。

关键词: 交通工程，多目标优化，关键车道，公铁平交道口，速度引导