Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram

A technology of elevated roads and calculation methods, applied in traffic flow detection, traffic control systems, traffic control systems of road vehicles, etc., can solve the problem of insufficient flexibility, lack of adaptability, and inability to meet the needs of dynamic use of elevated roads. and other problems, to achieve the effect of reliable and stable operation, high degree of refinement, and realization of realistic and fit management.

Active Publication Date: 2015-11-11
ANHUI SUN CREATE ELECTRONICS
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Problems solved by technology

However, the actual problem is that due to the different development levels of cities, the differences in regional road planning, and even the differences in road conditions and lanes between elevated roads in the same area, the above-mentioned uniform regulations that are only idealized and static often have insufficient flexibility and Lack of adaptability, so it is far from being able to achieve perfect pertinence to meet the dynamic use needs of elevated roads in each section

Method used

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  • Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram
  • Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram
  • Elevated-road-section traffic-jam critical value calculating method based on basic traffic diagram

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Embodiment 1

[0058] 1), according to the position of the entrance and exit ramp of the elevated road, the elevated road is divided into the entrance ramp, the exit ramp and the elevated road section, and a section of the elevated road section is selected as the detection object;

[0059] Obtain the traffic flow and vehicle speed data detected by the microwave radar detector of the selected elevated section, as follows:

[0060] (32,71),(24,73),(36,69),...(30,65),...(198,27);

[0061] The statistical period is 5 minutes, and a total of 288 pairs of data are obtained in one day.

[0062] 2), according to the traffic flow and vehicle speed data of the elevated road section, calculate the traffic flow and vehicle average speed within one collection period (that is, 1h) of the section:

[0063] That is:

[0064] 1h traffic flow is the sum of the traffic flow for every 5 minutes in this hour;

[0065] The average speed of vehicles in 1h is the average speed of all vehicles in this hour.

[0...

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Abstract

The invention belongs to the urban elevated road traffic diversion dredging field and especially relates to an elevated-road-section traffic-jam critical value calculating method based on a basic traffic diagram. The method comprises the following steps of 1) taking an elevated bridge road which connects adjacent exit and entrance ramps as one elevated road section; acquiring traffic flow data and each vehicle running speed data on each elevated road section; 2) calculating a traffic flow and an average speed of vehicles on each road section in each acquisition period; 3) taking a sample set; 4) drawing a scatter diagram of the basic traffic diagram; 5) calculating and acquiring a road average critical vehicle speed Vm at a maximum traffic flow and an unblocked vehicle speed Vf of the elevated road section. The method fits a current elevated-road actual dynamic change road condition of a current city. High accuracy of calculating data is ensured. An accurate basis can be provided for a traffic manager to carry out on-line traffic diversion so that unblocked performance of the traffic on the elevated road is finally guaranteed.

Description

technical field [0001] The invention belongs to the field of traffic diversion and dredging on urban elevated roads, and in particular relates to a method for calculating the critical value of traffic congestion in elevated road sections based on traffic basic maps. Background technique [0002] Traffic congestion is a concentrated expression of various social contradictions such as uneven population distribution caused by unbalanced economic development, limited urban transportation supply, and mismatch between urban layout and economic development. It is a worldwide problem. Compared with the ground traffic on the ground, the elevated road with three-dimensional traffic has a relatively high closed characteristic. Once congested, it is easy to cause long-distance and large-scale congestion, and even the regional road network is paralyzed. Will often face the situation of advance and retreat. Although the national "Road Traffic Status Information Release Specification" (GA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/01G08G1/052G08G1/065
Inventor 董婉丽邹娇杨灿孙晓静
Owner ANHUI SUN CREATE ELECTRONICS
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