高速公路施工区车速差异显著性测定
Variance significance determination of vehicle speeds in freeway work zones

为分析高速公路施工区不同交通控制区域的车速特性，基于现场试验与统计分析方法探究了双向四车道高速公路单向行车道封闭和半幅封闭半幅双向通行施工区车速的差异性，提出施工区车速差异分析的一种方法. 采用P-P概率图法分别对两类施工区不同交通控制区域的大型车、小型车速度进行正态分布检验；运用多独立样本Kruskal-Wallis检验方法对两类施工区不同交通控制区域的大型车、小型车速度分别进行差异显著性测定. 研究结果表明：单向行车道封闭和半幅封闭半幅双向通行施工区大型车、小型车速度均服从正态分布，施工区不同交通控制区域车速的差异性显著.
To analyze the characteristics of vehicle operating speed， the variance significance of vehicle speeds in carriageway lane closure and one-way closure work zones on dual-way-four-lane freeway was explored and a method on speeds variance analysis for work zones was proposed by using field tests and statistical analysis. The method of P-P probability plots was adopted to verify the normal distribution for the speed samples of trucks and cars in different traffic control divisions of carriageway lane closure and one-way closure work zones respectively， and the method of Kruskal-Wallis test was utilized to verify the variance significance of vehicle speeds among traffic control divisions respectively. The research results show that the speed samples of trucks and cars are normal distribution and there are significant variance in vehicle speeds in different traffic control divisions of carriageway lane closure and one-way closure work zones