Method for evaluating macroscopic road network traffic state based on floating car data

A technology of floating car data and traffic status, applied in the field of macro traffic flow, can solve problems such as difficulty in adapting

Inactive Publication Date: 2012-03-28
BEIJING UNIV OF TECH
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Problems solved by technology

Most of the existing evaluation methods have certain limitations, and it is difficult to meet the needs of different levels of users such as traffic management and planning.

Method used

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  • Method for evaluating macroscopic road network traffic state based on floating car data
  • Method for evaluating macroscopic road network traffic state based on floating car data
  • Method for evaluating macroscopic road network traffic state based on floating car data

Examples

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Embodiment Construction

[0035] The present invention evaluates the road network traffic state by taking the traffic state in the morning rush hours of working days in Chaoyang District, Beijing as an example,

[0036] The implementation steps are as follows:

[0037] (1) Calculate the evaluation index, use the formulas (1) and (2), and combine the macroscopic traffic flow theory to solve the evaluation index T of the selected area m , η, the calculated values ​​of C and S, the calculated results are shown in Table 2.

[0038] (2) structure evaluation objective function, the present invention's evaluation index has 4, is 4 dimension data, so n=4, thereby the objective function structure of model is as follows:

[0039] F(x)=[f 1(x), f 2 (x), f 3 (x), f 4 (x)] T

[0040] (3) Construct the index vector. In this case, 20 districts in Chaoyang District are selected as the evaluation area, so u=20, so the index vector is constructed as follows:

[0041] f k =[f 1，k , f 2，k , f 3k , f 4，k ] T ...

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Abstract

The invention discloses a method for evaluating traffic state of a macroscopic road network based on floating car data and relates to the field of macroscopic traffic flows. The method comprises the following steps of: acquiring travel time data by using a floating car system provided with a Global Positioning System (GPS) apparatus, processing data by using a geographic information system technology, obtaining various measured traffic state evaluation indexes, then respectively and sequentially constructing an evaluation target function, an index vector and an ideal interval vector, determining weighting value models of the evaluation indexes and finally determining an evaluation grade of the macroscopic road network traffic state by using a projection pursuit method. The four evaluationindexes utilized in the method are a minimum average travel time Tm, a road network operation damping coefficient Eta, a road network congestion index C and an arterial road traffic state parameter Srespectively. The invention realizes the macroscopic evaluation for the operation state of the urban road network, provides effective analytic tools for traffic management, planning and decision-making and enables the evaluation for the traffic state of the urban macroscopic road network to be more integral and reliable.

Description

technical field [0001] The invention belongs to the field of macroscopic traffic flow, and in particular relates to a macroscopic road network traffic state evaluation method. Background technique [0002] The rapid economic development and the change of travel concept make the operation of urban transportation system more and more uncertain factors, and the contradictions become more and more complicated, the most prominent manifestation of which is traffic congestion. Traffic congestion directly leads to the increase of problems such as delays, fuel consumption, environmental pollution, vehicle loss, and traffic accidents, and these problems will generate huge social costs. At present, traffic congestion in major cities has become a major problem that plagues the healthy development of cities in our country. How to ensure the healthy operation of the transportation system and maximize its urban carrier function is a serious issue facing the development of urban transportat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08G1/01G06Q50/00G06Q50/26
Inventor 荣建周翔翁剑成邹文杰
Owner BEIJING UNIV OF TECH
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