基于冲击波理论的USC几何信号相位控制模型
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1.河北省交通规划设计研究院有限公司;2.河北高速公路集团有限公司石安分公司;3.长安大学公路学院

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基金项目:

河北省重点研发计划项目(19275601D);中交科技基金([2018]05号)


USC geometric signal phase control model based on shock wave theory
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Affiliation:

1.Hebei Province Transportation Planning and Design Institute Co.;2.Hebei Expressway Group Co.;3.College of Highways, Chang'4.'5.an University

Fund Project:

Key R & D Program of Hebei Province (19275601D);CCCG Science and Technology Fund ([2018]05)

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    摘要:

    针对国内新型非常规平交口研究不充分、规范不完善及应用有限等问题,对USC平行流非常规平交口的几何布局和信号控制进行研究。根据USC的交通组织方式确定USC的信号协调原则,基于交通流冲击波理论分析USC各停车线处的排队情况,以平交口范围内车流运行时产生的时间关系与距离关系建立方程,并建立约束条件进行求解。通过交通参数输入,得到USC平交口的主、次平交口之间左转车道长度、信号周期长度、绿灯时长和信号相位差,进而对USC平交口进行几何设计和信号协调设计。最后,基于交通数据实测调查、VISSIM仿真模型建立,对比分析传统平交口和USC非常规平交口,并选取通行效率、安全性和交通可持续性三类评价指标进行评价。结果表明,通行效率方面,USC方案能有效降低延误、减少排队,且行程时间的改善程度随交通量增大而增大;安全性方面,USC方案冲突更少,TTC指标更高,产生碰撞的概率更低,DeltaS指标也低于传统方案,产生冲突的严重程度更小,因此USC安全性更好;交通可持续性方面,低交通量条件下USC的环境改善效果较差,但重交通条件下,USC的油耗和排放更低,表明USC在交通量大时对环境更友好。综上,USC在重交通负荷场景下有着更好的应用前景,具有实地修建价值。

    Abstract:

    Aiming at the problems of insufficient research, imperfect specification and limited application of new unconventional level crossing in China, the geometric layout and signal control of USC parallel flow unconventional level crossing are studied. According to the traffic organisation mode of USC to determine the signal coordination principle of USC, based on the traffic flow shock wave theory to analyse the queuing situation at each stop line of USC, to establish equations based on the time relationship and distance relationship generated by the traffic flow running in the range of the level crossing, and to establish constraints for solving. Through the input of traffic parameters, the length of left-turn lane, signal cycle length, green light duration and signal phase difference between primary and secondary level crossings of USC level crossing are obtained, and then the geometric design and signal coordination design of USC level crossing are carried out. Finally, based on the traffic data survey and VISSIM simulation model, the conventional level crossing and USC non-conventional level crossing are compared and analysed, and three types of evaluation indexes, namely, access efficiency, safety and traffic sustainability, are selected for evaluation. The results show that, in terms of access efficiency, the USC scheme can effectively reduce delays and queues, and the degree of improvement in travel time increases with the increase in traffic volume; in terms of safety, the USC scheme has fewer conflicts, a higher TTC index, a lower probability of collision, a lower DeltaS index than the conventional scheme, and a less severe degree of conflict, so the USC is safer; in terms of traffic sustainability, under low traffic volume conditions, the USC scheme is better than the conventional scheme, and the USC scheme is better than the conventional scheme in terms of safety. In terms of traffic sustainability, the environmental improvement effect of USC is poorer under low traffic conditions, but under heavy traffic conditions, the fuel consumption and emission of USC are lower, which indicates that USC is more environmentally friendly when the traffic volume is high. In conclusion, USC has better application prospects in heavy traffic load scenarios and has field construction value.

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  • 收稿日期:2024-06-13
  • 最后修改日期:2024-06-13
  • 录用日期:2024-07-03
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