检测器布设对路网行程时间可靠性估计精度影响研究

Influence of detector layout on estimation accuracy of travel time reliability to road network

为了提高路网行程时间可靠性估计精度,考虑交通断面检测器在目前城市中的应用,本文对检测器布设对路网行程时间可靠性估计精度的影响进行分析。首先,明确了路网行程时间可靠性的统计学定义;其次,在此基础上考虑行程时间影响因素,建立了路段行程时间模型、路网行程时间可靠性模型、自由流行程时间模型以及行程时间阈值模型;最后,以微观仿真路网为例,设置合理路网、信号配时以及相关参数,列出5个检测器布设方案,将仿真数据与路网实际真值数据进行对比分析,并进一步进行渗透率分析。研究结果表明,检测器布设的密度和位置会对路网行程时间可靠性估计造成影响,检测器在路网中铺设的不均匀、不完整将会降低路网行程时间可靠性精度,而在布设均匀且完整的情况下,提高检测器在路网中的铺设密度将提高路网行程时间可靠性精度。

In order to improve the reliability estimation accuracy of road network travel time, considering the application of traffic section detectors in cities at present, the influence of detector layout on the reliability estimation accuracy of road network travel time is analyzed. Firstly, the statistical definition of travel time reliability of road network is defined. On this basis, considering the impact factors of travel time, the road section travel time model, the road network travel time reliability model, the free popular travel time model and the travel time threshold model are established. Finally, take the microscopic simulation road network as an example, set reasonable road network, signal timing and related parameters, list five detector layout schemes, compare and analyze the simulation data with the actual truth data of the road network, and further analyze the permeability. The research shows that the density and location of detectors will affect the reliability estimation of travel time of road network. The results show that the non-uniform and incomplete laying of detectors in the road network will reduce the reliability accuracy of travel time of the road network, while in the case of uniform and complete laying, increasing the laying density of detectors in the road network will improve the reliability accuracy of travel time of the road network.