中文摘要：

采用路侧激光交通调查设备对城市道路信号交叉口下游12个断面的车速进行调查,得到5个车道12个断面的车速值。采用回归分析方法利用11种回归曲线对各车道车速与距离的关系进行分析,建立了各车道高峰和平峰时段的车速回归方程。对高峰和平峰时段各车道同一断面车速平均值与距离的关系进行分析,得到了相应的回归关系模型。回归分析表明：除了第1车道外,各车道车速与距离具有较好的相关性;各车道同一断面车速平均值与距离具有较强的相关性。研究结果表明：高峰和平峰时段车速在距上游交叉口700 m左右趋于离散;平峰时段车速略高于高峰时段,700 m之后高峰和平峰时段的车速基本相等。

英文摘要：

Applying roadside laser traffic survey facilities,the speeds at 12 cross-sections of backward section of a signalized intersection are investigated,and the speeds at 12 cross-sections of 5 lanes are obtained. By means of regression analysis,11 kinds of regression curves are applied to analyze the relationship between speed and distance to upstream signalized intersection,and the regression equations of speed of the lanes in peak and off peak periods are established. Then,the relationships between the average speed of the same cross-section of all the lanes and the distance in peak and off peak period are analysed,and the corresponding regression models are obtained too. The regression analysis result reveals that（ 1） there is a good correlation between speed and distance except for the first lane;（ 2） to the same cross-section of all the lanes,the average speed has a strong correlation with the distance. The research result indicates that（ 1） in peak and off peak periods,speed tends to disperse all at about 700 m to upstream signalized intersection;（ 2） the speed in off peak period is generally higher than that in peak period,the speed in off peak and peak periods is almost equal after 700 m.