基于高速公路路线设计一致性的中型卡车运行速度模型研究

Research on Operating Speed Models of Free-flowing Truck for Alignment Design Consistency of Expressway

本文详细分析受到不同线形影响下驾驶员的信息采集处理过程。在大量实测数据基础上,深入探讨中型车在高速公路自由流运行状态下其运行速度的变化规律。然后运用统计方法建立一整套预测精度高、适用范围广的中型车运行速度模型,并运用运行速度模型绘制了运行速度图。为运用基于设计一致性理念进行道路交通安全审核提供理论基础,同时也为道路规范和标准中使用运行车速线形设计方法提供数据支持。

The paper analyzed the driver's process of collecting and dealing with information of free-flow trucks on expressway in details.Based on great amount of field data,factors influencing speed and its variation patterns were definitely explored in this paper.A group of models were developed with statistical methods for prediction of operating speed under different alignments with design consistency concept.Compared with the result of field data,these models had the merit of high prediction accuracy of the 85th-percentile operating speed.The model could be applied widely in the alignment design approach of operating speed and traffic simulation.Finally,the paper had drawn a speed-profile of an expressway segment with these models.Thus designers and traffic engineers could diagnose and reduce inconsistency in design and ensure that most drivers would be able to operate at safety speed along entire alignments.This had laid good foundation for safety audit by utilizing operating speed to rate design consistency.At the same time,it provided data support for geometric design.