Freeway changeable speed limit control system and control method in rainy environment

Abstract

The invention provides a freeway changeable speed limit control system and a method in a rainy environment. The changeable speed limit control system comprises a vehicle detector, a rain gauge, a changeable speed limit signboard, and an overspeed snapshot system, wherein the vehicle detector, the rain gauge, the changeable speed limit signboard, and the overspeed snapshot system are respectively connected with a traffic controller, the traffic controller is used for receiving traffic flow detected by the vehicle detector and rainfall detected by the rain gauge, adjusting and finding out dynamic bottleneck road sections based on the traffic flow detected by the vehicle detector and the rainfall detected by the rain gauge, successively working out optimized speed limit values of the road sections by quadratic programming of nonlinear programming, showing the optimized speed limit values on the changeable speed limit signboard, and controlling the overspeed snapshot system to snap pictures according to the optimized speed limit values. The freeway changeable speed limit control system and the control method in the rainy environment can coordinate limited speeds of the road sections on the basis of guaranteeing safe operation of a freeway based on rainfall strength and traffic flow density features, respectively detect the rainfall strength and the traffic flow density through the rainfall detector and a coil detector, and achieve overspeed dynamic snapshot of the road sections, thereby guaranteeing safe and high-efficient operation of the freeway.

Description

technical field [0001] The invention relates to a variable speed limit control system and method in the field of traffic control, in particular to the variable speed limit control system and method in the rainy environment of expressways. technical background [0002] In my country, rainfall, as a common weather phenomenon, has a great adverse effect on the safe and efficient operation of expressways. Studies have shown that the probability of traffic accidents on expressways increases significantly in rainy weather. Using variable speed limit control technology can not only reduce the speed of vehicles, but also reduce the speed difference between vehicles, making the traffic flow tend to be stable and balanced. , so as to ensure the safe and efficient operation of the expressway in rainy days. [0003] At present, the highways in my country mainly adopt the static speed limit method. Although some expressways adopt the variable speed limit control method, they lack the va...

AI Technical Summary

Problems solved by technology

Patent application number 02224582.0 provides a variable speed limit display device without considering factors such as rainfall and traffic flow; patent application number 201010164710.x provides a variable speed limit control algorithm belonging to the field of tunnel safety , without considering the problem of speed limit control in bad weather, especially in rainy weather

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