公路三维视距的检验方法

Methods of three-dimensional sight distance inspection for highway

为了精确计算公路在三维空间中的实际视距,在公路行车视距的基础上,结合道路平、纵、横的道路线形,提出了三维计算模型和三维视距计算模型;通过检验三维视线上任意一点与其对应道路上点的高程关系,判断路面或路侧是否对视线造成遮挡,最后提出了三维视距检验的流程。研究结果表明:该模型和算法简洁直观,易于实现;在设计中,能及时表现行车视距的不利因素,为改进线形设计提供帮助;为自动检验三维视距提供了实现手段,同时也为利用三维视距进行安全性评价提供了技术支撑。

In order to accurately calculate the actual sight distance in three-dimensional space, combined with road alignment in horizontal, vertical and lateral section, a three-dimensional （3D） calculation model and 3D sight distance calculation model of road alignment are proposed, based on driving sight distance for highway. By inspecting the height relationship between an arbitrary point of line of sight and associated road point, the authors judge whether the surface and roadside cause occlusion about line of sight. Finally, the authors put forward the procedure of three-dimensional sight distance test. This model provides realization means for automatic checking of 3D sight distance and offers technological support for safety appraisal by using 3D sight distance. 9 tabs, 5 figs, 10 refs.