无信号T型交叉口的转弯速度特性及预测模型

Turning Speed Characteristic and Forecast Model of No-signal T-type Intersection

以舟山的一条二级公路为对象,采集车辆在自由形式状态下通过无信号T型交叉口的速度曲线,分析了车辆转弯通过无信号T型交叉口时的速度特性。重点分析了距离进口道线80 m处车速、进口道线处车速分布以及减速位置的分布,初步确立速度采集设备布设位置方案。通过选取距离交叉口进口道线80 m,50 m,30 m,20 m位置处的速度值,用指数函数、高斯函数、二次多项式函数和三次多项式函数分别预测进口道线处的速度,确定了最佳函数预测模型。

Taking a Class-II highway in Zhoushan as an example to collect the speed curve of vehicle passing through the no-signal T-type intersection at the free status, the article analyzes the speed characteristic of vehicle turning through the no-signal T-type intersection, focuses analysis on the vehicle speed at 80 m from the entrance line, vehicle speed distribution at entrance line and distribution of speed reduction position, and preliminarily defines the distribution position scheme of speed collection equipment.According to the speed values selected at the positions of 80 m, 50 m, 30 m and 20 m from the entrance line of intersection, the exponential function, Gaussian function, quadratic polynomial function and triple polynomial function are used separately to forecast the speeds at entrance line. The optimized function forecast model is defined.