基于视距的高速公路平曲线路段指引标志设置技术

Guide sign setting technology for highway horizontal curve section based on sight distance

基于驾驶员在夜间的视认特征建立了驾驶员的预瞄点模型,并根据驾驶员在平曲线路段的视认特征,建立了靠近中央分隔带与最内侧车道处的指引类标志视认模型,分析表明,靠近中央分隔带处为驾驶员视认平曲线路段指引类标志的最不利位置。理论计算结果表明:对于悬臂型交通标志,设计速度100 km/h的高速公路的半径小于200 m的平曲线路段应谨慎设置需要识读的标志;设计速度120 km/h的高速公路的半径小于400 m的平曲线路段应谨慎设置需要识读的标志,必要情况下应设置限速标志,降低驾驶员在该路段的行驶速度。

The driver's preview-point model is established based on the driver's visual recognition characteristics at night.According to the driver's visual recognition characteristics on horizontal curve section,the guide sign recognition model near the central reserve and the innermost lane was established.The analysis showed that position near the central reserve is the most disadvantaged position for the driver to recognize the guide signs on the horizontal curve.Theoretical calculation showed that:cantilever traffic signs should be set carefully to be read when the radius of the circular curve less than 200 m for highways with a running speed of 100 km/h,and when the radius of the circular curve less than 400 m for highways with a running speed of 120 km/h.If necessary,speed limit signs should be set to reduce the driver's driving speed on this road section.