Abstract:

Ramp is an important part of interchange, the ramp design idea based on the running speed is a new design idea of the highway and interchange. This paper is mainly focused on the interchange ramp running speed of the vehicle. Through the analysis of the influence factors of the interchange ramp running speed, the orthogonal experiment program is formulated, and then continuous running speed data of the vehicle on the four interchanges in Beijing is collected, in total of 14 ramps with the vehicle-mounted high precision GPS devices. According to 10 of these ramps’data, based on the running speed characteristics of the vehicle on the interchange ramp, the ramp is divided into three sections: deceleration section, uniform section, acceleration section. At last, the prediction model of each section between the interchange ramp running speed and the influence factors is established, and then the prediction model is verified through comparing the remaining four ramps’measured data. The results show that the relative error values of the prediction model are less than 5%, the accuracy of the model is validated.

Key words: traffic engineering, speed, interchange, ramp, orthogonal experiment, prediction model

摘要：

匝道是互通立交的重要组成部分，基于运行速度的匝道设计理念是目前公路及互通立交一种新的设计思路.本文以互通立交匝道小型车辆的运行速度为主要研究目标，通过分析互通立交匝道运行速度的影响因素，制订正交实验方案，运用车载高精度 GPS 设备，采集了北京市4 座互通式立交共14 条匝道车辆连续运行速度数据.根据其中 10 条匝道的数据，按照车辆在互通立交匝道上的运行速度特性将匝道分为三段：减速段、匀速段、加速段，构建互通立交匝道各个分段运行速度与影响因素之间的预测模型，并使用另外4 条匝道的实测数据对预测模型进行验证.结果表明，模型预测值的相对误差在 5%以内，验证了模型的正确性.

关键词: 交通工程, 运行速度, 互通立交, 匝道, 正交实验, 预测模型