Abstract: In order to study the road traffic safety restricted by environmental factors, taking “24-zigs” mountain road as an example, a road simulation scenario was established by using UC-win/Road simulation software.The virtual driving simulation was carried out by setting traffic flow, and the changing law of vehicle trajectory and the driving conflict area of “24-zigs” mountain road were obtained and analyzed.The results show that: the UC-win/Road simulation can clearly identify the conflict zones in various curved road sections. The conflict zones are different in different driving directions.When the upstream vehicle enters the straight curve section and the downstream vehicle exits the curve section, the possibility of collision with the vehicles is greater.The vehicles running on the “24-zigs” mountain road can mainly complete turning in their own lanes. Influenced by topography and alignment factors, the linear indexes of the 10th-zig and the 11th-zig exceed the standard limit values, and the lateral displacements of vehicles are 172.29 cm and 157.07 cm respectively, which can still ensure traffic safety. The “24-zigs” mountain road, which is composed of sharp turns and steep slopes, can satisfy the traffic safety in general. Its alignment design provides design inspiration and technical basis for highway construction in environmentally restricted areas.

Key words: highway engineering, “24-zigs” mountain road, driving simulation, vehicle trajectory, traffic safety, linear index

摘要： 为研究受环境因素限制的道路行车安全性，以“二十四道拐”盘山公路为例，应用UC-win/Road模拟软件，建立公路仿真场景，通过 设定交通流进行虚拟驾驶模拟，得到并分析车辆在“二十四道拐”盘山公路弯道路段的行车轨迹变化规律及行驶冲突区域。结果表明：UC- win/Road模拟可明确各弯道路段的行车冲突区域；不同行车方向行车冲突区域不同，上行车辆入弯直线段，下行车辆出弯圆曲线段，对向车 辆发生冲突的可能性较大；行驶于“二十四道拐”上的车辆基本能在自身车道内完成转向；第10拐、第11拐这两拐弯受地形及线形因素影响 ，线形指标超出规范极限值，车辆横向偏移量分别为172.29、157.07 cm，仍可保证行车安全性。由急弯陡坡组成的“二十四道拐”盘山公 路总体满足行车安全性，其线形设计为环境受限地段公路修筑提供设计启示与技术依据。

关键词: 道路工程, “二十四道拐”盘山公路, 驾驶模拟, 行车轨迹, 行车安全性, 线形指标