| As the number of vehicles in our country continues to grow,the demand for roads is increasing.The road network has been unable to carry the travel demand,so the traffic congestion caused has severely affected people’s lives and at the same time restricted economic development.In the context of informatized transportation construction,the way of publishing dynamic real-time traffic information with the help of computer software is generated.VMS(Variable Message Signs)is one of them.VMS is an important part of the Intelligent Traffic System(ITS).As the main release terminal of the outdoor guidance system,VMS plays a great role in alleviating traffic congestion.By publishing real-time road condition information,timely diversion of traveling vehicles enables drivers to pay attention to the changes in road conditions in time,so as to choose a reasonable and unobstructed route for travel.How to design a more reasonable traffic and road condition release system so that the information can be updated in real time,so as to guide the circulation of vehicles,and at the same time improve the traffic capacity of the road network,is the main problem that needs to be solved at present.In this regard,in response to this problem,the main work done in this thesis is as follows:(1)Regarding the increasingly complex road network structure and the traffic congestion caused by the increasing traffic volume on the road,this thesis first explains that the variable message signs can effectively alleviate traffic congestion,and explains the importance of information collection for the information release link.This thesis describes in detail the software design of the road information board information release system developed in C#language.This design adopts asynchronous programming method and introduces a timer message loop mechanism to complete the information release.The server periodically releases the real-time traffic situation to the variable message signs of the lower computer,and at the same time realizes the working status of the VMS at each stage by state transfer,thereby completing the real-time display of the VMS for the function of traffic situation.(2)The release method of road traffic situation is divided into Auto Navi mode and manual mode.In Auto Navi mode,you can obtain real-time traffic information through the interface service provided by Auto Navi Map API.In the manual mode,the traffic information is obtained through the collector collection and manual screening.Both modes generate the release template of the traffic situation through the processing of the traffic information,and obtain the road section light bands of the traffic congestion degree represented by three colors of red,yellow and green,and save the information.Finally,the information release terminal analyzes the information according to the agreed communication protocol,and sends real-time road condition information to the VMS inducing device through Ethernet communication,so as to realize the road traffic situation release in the two modes.(3)Traffic guidance information mainly plays the role of vehicle drainage by influencing the driving behavior of travelers.The single type of information displayed on the VMS is not conducive to improving the rate of obedience of drivers to the information on the variable message signs.Regarding this problem,this thesis improves the editing of information board guidance information,analyzes from the two aspects of information priority determination and information release type,and then redesigns and reforms the release information,and conducts experiments on specific road sections.The obtained experimental data results show that the improved variable message signs that releases information has a better effect in reducing travel delay time and increasing traffic speed during peak congestion compared to variable message signs that only release traffic conditions,which further illustrates The variable message signs has a balanced drainage effect on road vehicles. |
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