保证交通标志被驾驶员正确的识别和认知,是交通标志设置要考虑的首要问题。以大量的现场试验为研究手段,在交通标志可视距离研究的基础上,探讨了交通标志的视角阈值与车速和光线条件之间的相互关系,并给出了具体量化的数值表达。 To ensure that the traffic signs are correctly recognized and recognized by the driver is the most important issue to be considered in setting traffic signs. Based on a large number of field tests, based on the research of traffic signs visibility distance, the relationship between traffic signs’ perspective thresholds and vehicle speed and light conditions is discussed. Numerical examples are given for quantification.