低等级公路连续弯道小型车行驶轨迹偏移量的拟合

The Fitting of Travel Trajectory of Small Vehicle in the Continuous Curves of Low Grade Highway

以低等级公路小半径连续弯道为研究对象,采用便携式路侧激光交通调查仪调查交通流参数,人工记录法采集小型车辆通过连续弯道的行驶轨迹偏移量。并对小型车辆的行驶轨迹偏移量与运行车速进行二次多项式关系模型拟合,对行驶轨迹偏移量与观测断面位置进行三次多项式关系模型拟合。结果表明,行驶轨迹偏移量值总体上呈现出随着速度的增大而减小的二次多项式关系;车辆通过连续弯道过程中,行驶轨迹偏移量总体上呈现出"减小-增大-减小"的三次多项式关系。

Taking continuous curve with small radius of low grade highway,we applied the portable roadside lasertraffic survey instrument to investigate traffic flow parameters,and the manual recording method to collect themagnitude of travel trajectory skewing when vehicle passed through the continuous curve.Based on theinvestigation,the quadratic polynomial model was employed to fit the relationship between the travel trajectoryoffsets and the operation speeds of the small vehicles.And the cubic polynomial model was used to fit therelationship between the travel trajectory offsets and the locations of the observation sections.The results indicatedthat the value of travel trajectory offsets decreased with the increasing speed of the driving speeds;while themagnitude of the travel trajectory skewing showed a tendency of"decreasing-increasing-decreasing"in the processof the vehicle driven through the continuous curve.