设辅助车道的高速公路连续入出口最小净距

Minimum Spacing of Consecutive Entrance and Exit on Expressways with Auxiliary Lanes

摘要:

为明确连续入出口最小净距，基于三处互通交织区实测数据，分析了连续入出口交通流特性，通过拟合分析《Highway Capacity Manual 2010》交织区分析方法中的不同关键参数组合，结合遗传算法修正了交织区速度预测模型。将修正模型应用于《Highway Capacity Manual 2010》交织区分析方法，以交织区最大长度和最低服务水平为评估标准，提出了连续入出口最小净距建议值。最后构建了交通仿真模型，采用冲突率作为安全性的关键评级指标，对不同设计速度下的连续入出口最小净距建议值进行评价。结果表明，连续入出口净距与交织区流量、交织流量比及设计速度呈负相关，与车道数呈弱正相关，其中流量影响显著大于设计速度，入口流量主导性强。连续入出口最小净距建议值的评价等级均满足安全要求。

Abstract:

To determine the minimum spacing between entrance and exit ramps （collectively referred to as consecutive entrance and exit） with auxiliary lanes—a parameter not specified in current design codes—this study analyzed traffic flow characteristics using measured data from three interchanges. Key parameters from the 《Highway Capacity Manual 2010》 （HCM2010） weaving analysis method were fitted， and the weaving speed prediction model was optimized with a genetic algorithm. The revised model was applied within the HCM2010 framework to propose minimum spacing recommendations， using maximum weaving length and the lowest acceptable level of service as criteria. Simulation evaluations based on conflict rates confirmed that all recommended spacings meet safety requirements. The results indicate that spacing is negatively correlated with weaving flow， weaving ratio， and design speed， and weakly positively correlated with lane count—with flow exerting a significantly greater influence than design speed， and entrance flow playing a dominant role.