Study On Several Key Technology Of Highway Early Warning System

With socio-economy fast growing, freeway in our country has developed rapidly. The first freeway in our country was open in 1988.From it to now, freeway in our country developed rapidly. In this nearly 20 years, freeway mileage has increased progressively year by year. In the end of 2006, freeway mileage already reached 45,400 kilometers, which is the second in the world. Rapid development of the freeway, has improved our country highway traffic structure and the transportation efficiency effectively, has promoted the national economy growth, enormously has facilitated the lives of the people, has created the considerable social economy value. At the same time, traffic accidents in China's freeway have occurred frequently. Casualty and property damage that caused by freeway traffic accidents has increased year by year. According to statistics, in 2002, freeway accident death number in China is 3927, it is 3.59% of total number of road accident death. And in 2005, freeway accident death number in China had risen to 6407, it is 5.9% of total number of road accident death, with an average 1562 people died per 10,000 km, which was four times of accident death Common highway. According to the "to achieve the right of traffic control, early warning, guidance and control, contain or reduce hidden dangers of traffic accidents "of "11th Five-Year" plan, the establishment of early freeway warning system and implement of early warning management in China's freeway is the most urgent task.Based on the increasingly serious safety situation in China freeway, the highway safety management status is analyzed , significance of establishing early warning freeway system in china is expounded .Several key technical problems need to settled with establishment of freeway warning system in china. Three key technologies (information synergies technology, mathematical model of accident cause and accident "black spots" control technology)is studied that can resolve these critical issues.The information theory and the synergy theory is the base of information synergy technology. Traffic information of expressway in china have three characteristics, autonomy, distribution and heterogeneity. Based on these characteristics and existing information integration model, to establish information sharing platform through the integration of heterogeneous information, on the basis of our three existing electromechanical system, how to make use of information technology synergies is studied in the article. It aims to implement information sharing in section of freeway and management departments.Freeway cause analysis is very important to predict the occurrence of accidents. In this paper, system dynamics method is used to establish the cause mechanism of freeway accidents. Causation of the freeway transportation system is analyzed and the model of tectonic flow diagram is designed. The inherent connection and interaction mechanism of freeway accident cause is revealed.How to discern the "black spots" is the foundation of the control "black spots" in freeway warning Management. The paper introduces some existing identification methods of "black spots", and analyzes the advantage, disadvantage and the scope of application of each methods. And on this basis, identification method of "black spots" which is suitable for China is point out.