摘要
为分析降雨对车速离散性的影响,以城市快速路实测气象交通数据为基础、车速标准差系数为车速离散性的量化指标,利用二元线性拟合函数探究了降雨量、交通流量和平均车速之间的关系,解析了不同降雨量和不同交通状态(自由流、稳定流和饱和流)下的车速标准差系数特征和变化规律。结果表明,降雨量、交通流量越大,平均车速越小;大暴雨相比于大雨和暴雨对车速离散性的影响更显著;3种交通流状态下降雨量对车速离散性都有显著性影响,饱和流状态时的影响最大。
In order to analyze the effect of rainfall on the traffic speed dispersion, based on the empirical data of urban freeway meteorological traffic and the coefficient of standard deviation of vehicle speed as the quantitative index of speed dispersion, a binary linear fitting function is proposed to explore rainfall, traffic flow and mean speed. The relationship between the standard deviation coefficients of speed under different rainfalls and different traffic states(free flow, steady flow and saturated flow) is analyzed. The results show that the larger the rainfall and traffic flow, the smaller the mean speed;the heavy rainstorm has more significant impact on the speed dispersion than the heavy rain and rainstorm;the rainfall has significant influence on the vehicle speed dispersion under the three traffic flow conditions and when flow is saturated, the rainfall has the greatest impact.
作者
刘芳丽
涂辉招
王晓峰
吴兵
LIU Fangli;TU Huizhao;WANG Xiaofeng;WU Bing(College of Transportation Engineering, Tongji University, Shanghai 201804, China;Research Institute of Shanghai Meteorological Science, Shanghai 200030, China)
出处
《交通科技》
2019年第4期90-94,共5页
Transportation Science & Technology
关键词
交通安全
降雨
车速离散性
车速标准差系数
交通流量
平均车速
traffic safety
rainfall
traffic speed dispersion
coefficient of standard deviation of vehicle speed
traffic volume
mean speed
