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普通公路上设置路侧标志是提高公路交通安全最常用的措施. 由于多车道普通公路上大车率较高，内侧车道小车驾驶员视认标志容易受到外侧车道大车的遮挡，使路侧标志功能难以有效发挥. 本文在分析驾驶员视认标志特点的基础上，以我国最常见的双向4车道普通公路为研究对象，分析了内侧车道小车驾驶员受外侧车道大车遮挡问题，并以车流到达服从泊松分布为基础建立了路侧标志受大车遮挡的遮挡概率计算模型. 在此基础上，本文从重复设置、改变标志设置形式和位置三个角度提出了解决路侧标志遮挡问题的对策. 最后，通过一个实例分析，验证了本文研究结论的正确性和可行性.

Visibility of Roadside Signs for Multilane Ordinary Road

Setting roadside signs at the ordinary road is the most common measure to improve road traffic safety. Because of the relatively high percentage of heavy vehicles, it is easy for car drivers at median lane to be occluded by heavy vehicle at outside lane when car drivers recognize the roadside signs, and the actual role of roadside signs is difficult to play. Based on the visual characteristic of roadside signs, and taking the dual four-lane ordinary road as the research object, this paper analyzed the problem of car drivers at median lane being occluded by the heavy vehicles at outside lane, and developed the relevant occlusion calculation models under the condition of poisson arrival distribution of traffic flow. Then, relative countermeasures to solve the occlusion problem of roadside signs are proposed from three aspects: setting repeatedly, changing setting mode, and location. Finally, the correctness and feasibility of the results were verified by an example.