A Dynamic Expression Method of Urban Traffic Grid Lock Propagation Based on GIS

Abstract

The invention discloses a dynamic expression method of an urban traffic road network grid lock transmission based on a GIS. The method comprises the steps of: when an intersection overflow in an urban road network is detected, querying and displaying attribute information such as the occurrence time, the severity level and the position; assisted by a manual report manner, utilizing modern traffic detection technologies such as video image processing to obtain the increasing speed of vehicle queuing namely a stop wave speed, estimating a queuing length, and accurately predicting the transmission range of a prediction grid lock; based on a traffic wave theory, estimating the time for forming crossing interlocking caused by the propagating of the vehicle queuing length; and under the conditions that no traffic control measures are taken and no traffic flow induction is carried out, the dynamic process of the urban traffic road network grid lock changing with time and space is obtained on an electronic map. A scientific and reasonable data support is provided to traffic managers for making corresponding control measures, and the purpose of preventing the large-scale transmission of the grid lock is achieved.

Description

technical field [0001] The invention relates to the field of intelligent traffic systems, in particular to a dynamic expression method for urban traffic road grid lock propagation based on GIS. Background technique [0002] Traffic grid lock is a relatively new research topic, and there are relatively few researches at home and abroad. The traditional car-following model is not comprehensive. It only considers the impact of queuing in the time dimension and does not consider the impact in the space dimension. It cannot be fully applied to the research of traffic overflow phenomenon. The spatio-temporal characteristics of traffic grid locks are very significant, and GIS technology can efficiently solve problems related to space and time. The GIS-T technology that crosses and extends with intelligent transportation technology has formed a new research field. In the transportation sector There are a wide range of applications. [0003] Through searching, we found: [Li Shuguan...

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Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention discloses a dynamic expression method of urban traffic road grid lock propagation based on GIS. When the intersection overflow in the urban road network is detected, the generated Attribute information such as the occurrence time, severity, and location of the overflow event; according to modern traffic detection technologies such as video image processing, supplemented by manual reporting measures, the growth rate of vehicle queuing, that is, the wave velocity of parking waves, is obtained to estimate the queue length and correctly predict the grid. The spread range of the lock; based on the traffic wave theory, estimate the interlocking time of the intersection formed by the spread of the vehicle queue length; and realize the urban traffic road on the electronic map without any traffic control measures and traffic flow induction. The dynamic process of grid locks evolving with time and space provides scientific and reasonable data support for traffic managers to formulate corresponding control measures, so as to prevent the large-scale spread of grid locks

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