A fast road congestion warning and dynamic speed limit method under foggy conditions

Abstract

The invention discloses an expressway congestion early warning and dynamic speed-limiting method under the condition of fog. The feature that traffic congestion can quickly spread towards the upstream is considered, the spreading speed of a congestion wave and the visual distance under the condition of the fog are used for calculating a speed-limiting valve, and the speed-limiting valve and a congestion early warning are displayed on a roadside variable information notice board. The purposes that the congestion early warning is given out on the upstream of a fog area, and the speed of vehicles for traveling into the fog area is controlled are achieved, and therefore the occurrence probability and the serious degree of rear-end collisions caused by bad sight distance in a foggy day on the upstream of the congestion road section in an expressway are lowered. Thus, important significance is achieved on the aspect of improving the traveling safety under the adverse weather in the expressway.

Description

technical field [0001] The invention relates to a fast road congestion early warning and dynamic speed limit method under foggy conditions, belonging to the technical fields of traffic safety and intelligent traffic. Background technique [0002] With the rapid increase in the mileage of expressways and the number of motor vehicles in my country, the related issues in the field of road traffic safety have been paid more and more attention. Vehicles often encounter bad weather when driving on express roads, which has a huge adverse effect on the safe operation of vehicles, and can easily lead to traffic safety accidents and major and vicious accidents. Among them, foggy weather is one of the worst meteorological conditions affecting visibility. When driving in foggy weather, due to the scattering and absorption of light by fog, the clarity of the outline of the target object is reduced, and the driver cannot see the situation ahead and around. When a high-speed vehicle enter...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a fast road congestion early warning and dynamic speed limit method under foggy conditions, which solves the problem of the relationship between the visibility and the speed limit value due to the lack of existing speed limit methods. In-depth and reasonable analysis, lack of consideration of the phenomenon of congestion waves propagating to the upstream of the expressway, resulting in the inability to issue congestion warnings upstream of the foggy area and control the speed of upstream vehicles entering the foggy area, thereby increasing the probability of rear-end collisions and serious accidents. matter of degree

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