基于准相对风险暴露量的地下快速路入口匝道行车风险机理及安全设计方法

Since the traffic environment at underground expressway entrance section is rather special, road alignment is also very complex, and traffic characteristics are quite different from those on the ground, it’s specified as an accident hazardous location. The current project takes driving risk as an alternative indicator for accident index, studying on the driving risk mechanism and safety design of underground expressway entrance ramp. Firstly, the project puts forward a set of risk evaluation indexes and establishes an evaluation method of driving risk continuity considering both car-following and lane-change behaviors. Natural driving and simulated driving methods are used respectively to collect data of driving behaviors and traffic environment at entrance ramps and the driving risk database is presented. Secondly, based on quasi-induced exposure method and characteristic analysis of driving behavior, driving risk mechanism will be able to get revealed considering the functioning of multiple design indexes and traffic environment. Thirdly, based on the driving risk database, the relational model between multi-dimensional road design index and driving risk of underground expressway entrance ramp is established. The optimal design method of underground expressway entrance ramp is proposed on the basis, which provides a theoretical guidance for the safety design of underground expressway entrance ramp. The research will be significant for traffic management and accident prevention of underground expressway entrance ramp.

地下快速路匝道入口路段道路交通环境特殊、线形复杂，行车特征与地上快速路存在差异，往往是事故多发路段。为改善其安全性能，本项目拟采用行车风险作为事故替代性指标，研究地下快速路入口匝道行车风险机理及安全设计方法。首先，基于安全约束条件，提出入口匝道行车风险评价指标。综合跟驰及换道行为，建立行车风险连续性评价方法。采用自然驾驶和模拟驾驶实验平台采集数据，建立入口匝道行车风险数据库。其次，基于准相对风险暴露量分析方法，研究不同道路交通条件下地下快速路入口匝道行车风险的差异，识别行车风险关键影响因素。并通过驾驶行为特性分析，揭示地下快速路入口匝道道路交通条件对行车风险的作用机理及其与地上快速路存在差异的主要原因。最终，考虑多指标耦合作用，建立地下快速路入口匝道设计指标与行车风险的关系模型，提出线形设计优化方法，为其线形安全设计提供理论指导，对地下快速路入口匝道交通管理和事故预防有重要意义。

地下快速路匝道入口路段道路交通环境特殊、线形复杂，行车特征与地上快速路存在差异，往往是事故多发路段。为改善其安全性能，本项目采用行车风险作为事故替代性指标，研究了地下快速路入口匝道行车风险机理及安全设计方法。首先，基于安全约束条件，提出了入口匝道行车风险评价指标。综合跟驰及换道行为，建立了行车风险连续性评价方法。采用自然驾驶和模拟驾驶实验平台采集数据，建立了入口匝道行车风险数据库。其次，基于准相对风险暴露量分析方法，研究了不同道路交通条件下地下快速路入口匝道行车风险的差异，识别了行车风险关键影响因素。并通过驾驶行为特性分析，揭示了地下快速路入口匝道 道路交通条件对行车风险的作用机理及其与地上快速路存在差异的主要原因。最终，考虑多指标耦合作用，建立了地下快速路入口匝道设计指标与行车风险的关系模型，并提出了线形设计优化方法。