城市地下道路车速特征及运行车速模型

采用实车测速实验,在上海市8条城市地下道路中进行车速数据的采集,并选取156个典型线形路段,研究地下道路中车速的分布特征及运行车速.通过多元逐步线性回归建立城市地下道路运行车速预测模型,模型自变量包括车道宽度、纵坡、车道数、限速、分合流、洞口等.结果表明,预测模型的拟合效果良好,通过预测值和实测值的比较验证了模型的有效性.同时发现限速对城市地下道路中运行车速的影响很小.运行车速预测模型适用于设计车速在40~80km·h-1,双向4~8车道的城市地下道路中.

Characteristic and Prediction Model for Operating Speed Model in Urban Underground Road

Real car experiments on eight urban underground roads in Shanghai Municipality were conducted in this paper. A total of one hundred and fifty six measured data were used to fit four presented characteristic and prediction models. The stepwise linear regression method was employed to predict the proper 85th percentile operation speed on urban underground road. Four regression models were used to investigate the relations between operating speed and corresponding roadway factors including lane width, slope grade, number of the lanes and speed limit, etc. The prediction made by using the presented models can meet real car experimental results on a ninth urban underground road very well, which indicates the applicability and reasonability of the models. In addition, the speed limit was found to have very small effect on the operating speed in underground roads. The models put forward in this paper are believed to be useful for operating speed prediction for urban underground road with four to eight lanes at a design speed of 40 to 80 km·h-1.