Urban expressway on-ramp and main line collaborative signal control system and method

Abstract

The invention relates to an urban expressway on-ramp and main line collaborative signal control system and method. The system comprises an on-ramp upstream detector, an on-ramp downstream detector, a main line upstream detector, a main line downstream detector, an on-ramp, a main line signal lamp and a processing control center. The processing control center judges whether a main line is blocked or not according to the detection speeds and the time occupation rates of the main line upstream detector and the main line downstream detector, and starts on-ramp and main line collaborative signal control if the main line is blocked. The processing control center confirms a timing plan for control according to flows detected by a ramp detector and the main line and ramp demands. After a period is finished, the processing control center judges whether the main line blockage is finished or not according to the detection speed and the time occupation rate of the main line upstream detector, continues to perform signal control if the blockage occurs and stops signal control if the blockage does not occur. The system releases main line and ramp vehicles in turn in an expressway blockage period through the collaborative signal, changes two orderless conflict flows into an order saturate flow, improves the bottleneck point passing capacity of the main line and greatly improves the convergence safety.

Description

technical field [0001] The invention belongs to the field of expressway traffic control, in particular to an urban expressway on-ramp and main line coordinated signal control system and method. Background technique [0002] The expressway system plays the role of the main skeleton road network in the traffic of large cities, and undertakes a large number of motor vehicle trips in the city. Ensuring the efficient operation of the expressway system has always been the top priority of the traffic management department. [0003] The on-ramp is the channel for the transition between the continuous flow of urban expressways and the discontinuous flow of surface roads. The main line of the expressway is located downstream of the in-ramp merging point. Due to the inflow of ramp traffic, the number of lanes on the main line has not increased accordingly, so it has become a bottleneck restricting the capacity of the expressway. During peak hours, expressway congestion is often induced...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the problem of insufficient utilization of the traffic capacity and poor safety of the main line of the main line of the expressway during the congestion period, and provide a coordinated signal control system and method for the on-ramp of the urban expressway and the main line

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