Operating speed is a basic measure for studying the safety of freeways. However, whether the designed speed matches the actual operating speed of large vehicles is worth studying. As such, this study included a large number of aggregated vehicle global positioning system (GPS) datasets used to analyse the actual speed of large vehicles under different alignment conditions on the freeway; and supplement the theoretical operating speed model. Using the traditional operating speed prediction model, the theoretical speed of each section was calculated. Two months of vehicle GPS data from freeways was extracted from a vehicle monitoring platform, the actual operating speed of each section was obtained. The similarities and differences between the theoretical operating speed and the actual vehicle speed on the horizontal and vertical curves were analysed and compared. The results indicate that the actual speed of large vehicles was obviously higher than the theoretical speed operating downhill. When the vehicle was operating uphill, the vehicle's actual speed was significantly lower than that of the theoretical speed. The actual vehicle operating speed data can be used as a new method for evaluating the safety of large vehicles on the freeway.

中文翻译：

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基于汇总的GPS数据对高速公路对准中的大型车辆行驶速度特性进行建模

行驶速度是研究高速公路安全性的基本措施。但是，设计速度是否与大型车辆的实际运行速度匹配值得研究。因此，本研究包括大量的聚合车辆全球定位系统（GPS）数据集，用于分析高速公路上不同对齐条件下大型车辆的实际速度；并补充理论运行速度模型。使用传统的运行速度预测模型，计算每个部分的理论速度。从一个车辆监控平台提取了两个月的高速公路车辆GPS数据，获得了每个路段的实际运行速度。分析并比较了水平和垂直曲线上理论工作速度与实际车速之间的异同。结果表明，大型车辆的实际速度明显高于下坡时的理论速度。当车辆在上坡行驶时，其实际速度明显低于理论速度。实际车辆行驶速度数据可以用作评估高速公路上大型车辆安全性的一种新方法。