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

A fast road, dynamic speed limit technology, applied in the field of traffic safety and intelligent transportation, can solve problems such as increasing the probability and severity of rear-end collisions, inability to issue congestion warning upstream in foggy areas, and lack of upstream vehicle speed.

Active Publication Date: 2015-11-25
SOUTHEAST UNIV
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 reas

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A fast road congestion warning and dynamic speed limit method under foggy conditions
  • A fast road congestion warning and dynamic speed limit method under foggy conditions
  • A fast road congestion warning and dynamic speed limit method under foggy conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Such as figure 1 Shown: a kind of rapid road congestion early warning and dynamic speed limit method under foggy conditions, it is characterized in that, comprises the following steps:

[0038] (1) Determine the propagation velocity V of the congestion wave when congestion occurs downstream of the foggy area of ​​the expressway s .

[0039] The congestion wave is a shock wave generated from downstream to upstream during traffic congestion. Traffic bottleneck is a common traffic phenomenon in actual roads. The traffic capacity in the bottleneck area is usually lower than the normal road section. When the traffic demand is greater than the traffic capacity in the bottleneck area, queuing will occur at the starting position of the bottleneck, and the queuing congestion will spread to the upstream road section. . When congestion occurs in the downstream of the e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G08G1/09
Inventor 李志斌刘攀王炜郭延永
Owner SOUTHEAST UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap