作者：刘 硕 王俊骅 张兰芳 方守恩
摘 要:采用实车测速实验，在上海市八条城市地下道路中进行了车速数据的采集，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，并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。运行车速预测模型可适用于设计车速在40km·h-1~80km·h-1，双向四至八车道的城市地下道路中。
关键词: 地下道路；运行车速；道路线形；线性回归；限制车速
Abstract: Real-car experiments on eight urban undergroundroads in Shanghai city were firstly carried out in current research. Totally one hundred and fifty-six measured data were used to fit four presented characteristic and predictionmodels. Stepwise linear regression method was employed to predict the proper 85th percentile operation speed on urban underground road. Four regression modelsare used to investigate the relations between operating speed and correspondingroadway factors including lane width, slope grade, number of the lanes andspeed limit, etc. Prediction by using the presented models can meet real-carexperimental results on a ninth urban underground road very well, whichindicates the applicability and reasonability of the models. In addition, speedlimit was found to have very small effect on the operating speed in undergroundroads. The models put forward in this paper are believed to be useful foroperating speed prediction for urban underground road with four to eight lanesunder a design speed of 40 to 80 km/h.
Keywords: urban underground road; operating speed; road alignment;linear regression; speed limit