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People's travel and traffic safety are affected by low visibility. With the development of transportation in recent years, the detection of license plate area under low visibility has become one of the hot topics of research. This article studies the license plate detection under low visibility based on video images. The research content is divided into two parts: defogging and license plate inspection. First of all, the collected image is processed in grayscale, the related defogging coefficient is set, and the dark channel algorithm is used to remove the fog component in the image, which greatly improves the clarity of the image. Second, using the top hat calculation related theory, combined with the image edge extraction, opening and closing operation steps to detect the license plate area. Finally with the help of MATLAB software for test verification, the results show that the algorithm has a good detection effect.

The concept, Traffic Calming, was introduced to China nearly more than 10 years ago. However, no engineering practice emerges for a long time. As a typical small rural town for tour in Beijing, Zhaitang Town requires more attention on the beautiful site and pedestrian safety. In 2008, Beijing Mentougou Highway Sub-bureau decided to change the reconstruction of Zhaitang Avenue into a pilot engineering project of traffic calming. According with the research results of the traffic features in Zhaitang, the combination of mainly physical measures that reduce the negative effects of motor vehicle use, alter driver behavior and improve conditions for non-motorized street users were applied, such as Speed Humps, Raised Crosswalks, Raised Intersections, Speed Cushions, Roundabouts, Chicanes, Neckdowns, Center Island Narrowings, Lateral Shifts, Median Diverters, Boom Barrier, Pedestrian Refuges, and so on. After a half year observation, the before-andafter data of the first traffic calming engineering project has been achieved. The principles, methods, techniques to set traffic calming facilities resulted from the project and the outcome evaluation are described in the paper.

Based on the survey and analysis of current status of VMS systems application in China, this paper makes innovative study on the information disseminating strategies of Intelligent Motorway Fog Information Dissemination System (IMFIDS) via connected VMS, and then brings forward detailed strategies for two conditions: road opening but visibility under 200 meters and road closed down respectively. The strategies have been demonstrated in the pilot project - Huning Motorway Fog Semiautomatic Information Dissemination System.