山区一级公路隧道出口与平交口最小间距研究

Study on Minimum Spacing between Tunnel Exits and At-Grade Intersections of Class I Highways in Mountainous Areas

摘要:

在山区一级公路体系中，隧道与平交口既是串联路网、保障通行的核心组成部分，也因交通流交汇、环境突变等特性，成为事故高发区域。现行公路设计规范中，未对隧道出口与平交口的合理间距作出明确规定，导致设计人员在实际工作中缺乏统一参考依据。通过对驾驶员驾驶行为及车辆运行轨迹分析，从明暗适应、标志识读、车辆变道、平稳驶入四个核心维度，构建隧道出口与平交口的间距计算模型，并结合设计速度、车道数给出具体参考值，以期为规范完善与工程设计提供理论支撑与技术依据。

Abstract:

In the system of Class I highways in mountainous areas, the tunnels and at-grade intersections are not only core components that connect the road network and ensure traffic flow, but also high-accident areas due to characteristics such as the convergence of traffic flows and sudden environmental changes. Current highway design specifications do not clearly stipulate the reasonable spacing between tunnel exits and at-grade intersections, resulting in a lack of unified reference for designers in practical work. By analyzing the driving behaviors of drivers and the vehicle operation trajectories, a spacing calculation model for tunnel exits and at-grade intersections is built from four core dimensions such as light-dark adaptation, sign recognition, vehicle lane changing and smooth entry. Combined with design speed and number of lanes, the specific reference values are proposed in order to provide theoretical support and technical basis for the improvement of specifications and engineering design.