Method for drawing regional road network traffic condition macroscopic basic diagram

Abstract

The invention relates to a method for drawing a regional road network traffic condition macroscopic basic diagram. The method comprises steps that 1), flow and saturation data of crossing lanes is acquired through an SCATS coil, and data cleaning is carried out to remove abnormal coil data and abnormal period data; 2), an occupancy rate is calculated through utilizing the SCATS data; 3), the occupancy rate is corrected; 4), weighted average of the occupancy rate and the flow at the fixed period is carried out; and 5), the occupancy rate and the flow after weighted average are utilized to draw the network traffic condition macroscopic basic diagram. The method is advantaged in that the real-time data based on the SCATS coil is more accurate compared with the prior art.

Description

technical field [0001] The invention relates to the field of urban road network management, in particular to a method for drawing a macro basic map of regional road network traffic status. Background technique [0002] Urban road network is a complex network that exists in reality, and the management method of optimizing its single "node" or "edge" usually cannot achieve the purpose of optimizing the system, and sometimes even backfires. It is easier to obtain regional traffic management policies that adopt the idea of ​​optimizing a wider range better effect. [0003] The implementation of regional traffic management policies needs relevant evidence as a reference, so a new method for evaluating regional traffic status is needed. The emergence of Macroscopic Fundamental Diagram (MFD for short) provides a good technical choice for evaluating regional traffic status. [0004] MFD is a basic map of traffic flow drawn using the average flow and density of the regional road ne...

AI Technical Summary

Problems solved by technology

Theoretically, drawing regional MFD requires the length of the road section and the density and flow of each time period, but cities equipped with SCATS systems generally do not have the conditions to obtain large-scale ground road density. SCATS systems only have a single detection coil at the stop line, and a single The density of the coil cannot be obtained. At present, although there are empirical precedents of using SCATS data for MFD in foreign countries, they either use additional data to estimate the density, or break away from the definition of MFD, and turn from the stable existence of MFD. Based on the MFD properties such as the phenomenon of "hysteresis loop" in local congestion, draw a graph that satisfies such properties

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