基于ETC交易数据的高速公路行程速度提取模型  

A Model of Travel Speed Calculation for Freeway Road Segments with ETC Transaction Data

作　　者：翁剑成[1] 王媛[1] 袁荣亮 马思雍 

机构地区：[1]北京工业大学北京市城市交通运行保障工程技术研究中心,北京100124 [2]北京市城市规划设计研究院,北京100045

出　　处：《交通信息与安全》2017年第5期76-82,共7页Journal of Transport Information and Safety

摘　　要：为了提高高速公路运行状态的监测水平,基于ETC交易数据预处理,根据计算周期内路段ETC数据量的大小,搭建了不同样本量水平条件下行程速度的提取模型。利用包含对象路段的多个OD对ETC交易数据提取路段的行程速度,提出基于OD对速度折减系数和可信度权值的速度修正方法,解决了小样本条件下速度提取可信度较低的问题。以北京市高速公路路段数据进行了现场验证。结果表明,模型的平均绝对误差为4.5km/h左右,平均相对误差为6.5%左右;高峰和非高峰时期的误差均方差分别为2.38km/h和3.39km/h,说明高峰时期的速度提取稳定性优于非高峰时期。仅利用ETC数据不能完整反映车辆的行驶状态,未来可融合其他数据源,进一步提高高速公路运行状态提取的准确性和可靠度。Aiming to enhance the level of monitoring of expressway status,aprocedure of data preprocessing is presented,and structure of ETC transaction data within a calculation period is analyzed to establish a dual-level calculation model of travel speed under different levels of sample sizes.In order to improve credibility of velocity extraction under conditions of small samples,the ETC data of different enter-leave toll plazas pairs is used to extracting the travel speed of a road section.A velocity correction method is proposed bases on the speed reduction factorαand speed reliable weightθcoming from OD investigation.The model is verified by a special designed field experiments.The results show that the mean absolute error is 4.5 km/h,and the average relative error is about 6.5%.The mean square errors are 2.38 km/h and3.39 km/h in peak and non-peak periods,respectively.It shows that stability of the model in peak periods is better than which in non-peak periods.However,the results cannot entirety reflect driving states.In future,other data can be applied to increase the accuracy and reliability of traffic running status on freeways.

关 键 词：交通工程 ETC数据 速度提取模型 数据挖掘 高速公路 信息提取 

分 类 号：U491.1[交通运输工程—交通运输规划与管理]