A Downstream Area Signal Optimization Method for Single Point Bottleneck
An optimization method, downstream technology, applied in the field of intelligent transportation research, which can solve problems such as economic and social losses, dominoes, deadlocks, etc.
Active Publication Date: 2018-02-27
ZHEJIANG UNIV
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Problems solved by technology
As an important node in the urban road network, the bottleneck intersection may cause the "domino" and "deadlock" phenomenon of urban road network congestion, resulting in serious paralysis of road network traffic, resulting in serious economic and social losses
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[0061] Below in conjunction with accompanying drawing, the present invention is described in detail, as figure 1 Shown, the inventive method flow process step is as follows:
[0062] step one
[0063] Determine the control traffic flow and control area:
[0064]
[0065]
[0066]
[0067] In the formula, I i out is the set of all outgoing traffic flows at the downstream intersection of traffic flow i;
[0068] alpha j,i is the sharing ratio of traffic flow j to traffic flow i;
[0069] q j,i is the flow rate of traffic j leaving traffic i, that is, turning to traffic l i,j The flow rate (veh / s).
[0070] Assume that a bottleneck section n is found in the road network s , downstream section n j The contribution rate of inflow flow is 0.4, and the traffic saturation is 0.7. Due to η d,max and x d,max are 0.3 and 0.9 respectively, so the downstream segment n j It can be used as a bottleneck control area to meet the regulation requirements, and the traffic f...
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The invention discloses a downstream region signal optimization method for a single-point bottleneck. According to the method, a road bottleneck is removed from the viewpoint of areas by accurately describing space-time correlation characteristics of node traffic states in the areas and reasonably adjusting signal timing parameters of downstream nodes. The method includes the following concrete steps: establishing a traffic flow sharing rate model, and determining regulation and control of traffic flow and a control area through set thresholds; calculating a drive-in and drive-off flow rate difference in an original control scheme; calculating the total upstream and downstream input capability regulation amount needed by an initial queuing; distributing the total regulation amount; and regulating a traffic flow green ratio, and finally obtaining a bottleneck control scheme. The method comprehensively takes various traffic flow parameters into consideration on the basis of the downstream flow rate of a bottleneck road, automatically identifies bottleneck traffic flow and controls a bottleneck associated interaction in real time, quickly and effectively solves bottleneck congestion situations, and is easy to realize in construction.
Description
technical field [0001] The invention relates to a single-point bottleneck-oriented downstream area signal optimization method, which is used for urban traffic control and management and belongs to the field of intelligent traffic research. Background technique [0002] With the continuous development of urban economy and the continuous expansion of urban scale, the problem of urban road traffic congestion is becoming more and more serious, which seriously affects people's daily life and the stable development of society. How to find effective ways to control traffic congestion is an important issue in traffic engineering today. One of the research hotspots in this field. [0003] The unbalanced temporal and spatial distribution of traffic demand in the road network will cause the queue length of individual road sections to be close to or even equal to the length of the road section, which will affect the normal release of traffic flow at upstream intersections. This road se...
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IPC IPC(8): G08G1/08
CPCG08G1/08
Inventor 马东方龚成宇王殿海金盛祁宏生
Owner ZHEJIANG UNIV