A Method for Obtaining Expressway Congestion Index

Abstract

The invention discloses a method for obtaining the congestion index of a motorway, and the method comprises the steps: calculating a traffic condition parameter through definition, wherein the traffic condition parameter serves as a congestion index of the condition of atom road segments; calculating and obtaining the congestion index of a road through the calculation of the dynamic road section importance of all atom road segments; and obtaining the congestion index of the whole road network through calculating the dynamic road segment importance of all roads in a road network. The road condition parameter is approximately equal to the traffic flow density. The traffic flow density is obtained through the ratio of a road segment inventory to the product of a road segment length and a lane number. The inventory is obtained through the back calculation of the average speed of the traffic flow. The method is direct and simple in calculation, can quantify the road condition and depict the congestion in a systematic and layered manner, reflects the operation condition of a motorway network, can provide decision-making support for a traffic manager, provides reference for the travel of persons, alleviates or reduces the congestion of the motorway, and saves the social cost.

Description

technical field [0001] The invention relates to a calculation method of highway congestion index, in particular to a layered congestion index modeling and congestion index acquisition method based on expressway import and export toll data. Background technique [0002] At present, my country's expressway road network has basically realized the provincial network toll collection. Taking the ordinary expressway toll system as an example, its basic operation mode is that when the vehicle enters the expressway road network system, the card is issued and written, and the vehicle leaves the expressway road. Card-reading charges in the network system; although the main system goal of the toll system is to charge online, a large amount of traffic flow every day will generate a large amount of raw data of toll records, and these toll records contain rich attribute information, such as entry / The time of leaving the expressway network, the vehicle type, the station entering / exiting the ...

AI Technical Summary

Problems solved by technology

The problem of calculating the road congestion index through this model is that the average daily vehicle mileage is an indirect traffic parameter, which is difficult to obtain under the current domestic highway data collection system conditions.

[0011] The problem with this index is that it is aimed at urban traffic congestion roads, and only pays attention to local roads, so it cannot systematically evaluate the congestion level of the entire traffic system

[0014] In addition to the same shortcomings as the above-mentioned CSI, the travel time index TTI is basically obtained based on limited section coil data or a small amount of floating car data. These data have poor temporal and spatial representation, so this index is used to represent traffic The level of congestion in the system, the accuracy of which is uncertain

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