视觉减速标线控速效果评价

为分析视觉减速标线的控速效果和影响范围,选取南宁市6处视觉减速标线路段进行了实地车速采集,获取了视觉减速标线上下游各500m范围内13个断面的地点车速,共计样本约6 300个。利用断面车速数据构建速度-距离曲线,研究了车速的变化规律和视觉减速标线控速影响范围;采用t检验和比例检验分别检验了视觉减速标线上下游控制点及标线末端车速平均值之间的差异显著性和超速比例的差异显著性,验证了视觉减速标线的控速效果,并通过与对照组数据的对比排除了其他因素的干扰。结果表明,视觉减速标线的控速范围为上下游约250m;车辆平均速度下降程度为2.4~4.2km/h,超速车辆比例下降9.4%~15.6%。

Evaluation of the Spccd-control Effects of Illusionary Pavement Markings

In order to analyze the effects and influence scope of illusionary pavement markings, six segments, which were installed with illusionary pavement markings in Nanning City, were selected to collect the speed data. Speed data at 13 sections within the area of 500m upstream and downstream of the illusionary pavement markings were collected. Totally 6300 samples were obtained. The speed-distance curve was built based on the cross section speed data, and the laws of speed variation and influence scope were evaluated. Using t test and proportion test, the significant differences of speed between upstream/downstream control point and the end point of the markings, as well as the over-speed proportion, were tested. By comparing with the control group, other interfering factors were excluded, and the speed reduction effects of the illusionary pavement markings were evaluated. The results show that the influence scope of illusionary pavement markings is about 250m from upstream to downstream, that the decline of average speed is about 2.4 km/h--4.2km/h, and that the decline of over-speed proportion is about 9.4%-15.6%.