Based on this background, research on the above problem has been done, and the main contents are as follows:index system of expressway tunnel group accident are obtained through the research on a variety of past accidents, and the the factors affecting the safety of tunnel group are listed.

Study on the Integrated and Intelligent Surveillance and Control Technique and Software Development for Expressway Tunnel;

Study on Safety Estimation of Expressway Tunnel;

With the development of the expressway,the large cross section expressway tunnel with three lanes will be an important part of the highway tunnels.

According to the data of post-construction monitoring for a highway tunnel, the internal ferces in the reinforced rock, shotcrete, steel arch and lining were s till evolving.

The highway tunnel is an important component of highway, problem such as whose environment, development already becomes the gradually outstanding problems.

This paper makes technical analysis and comparison on various video transmission system plans,introduces point-to-point transmission plan applied in Cangling Tunnel on Taizhou─Jinhua Highway,and discusses the selection and application of video transmission plan in video monitoring system for highway tunnels.

The present monitoring systems for freeway tunnel focus mostly on traditional MIS(Management Information System),which gives rise to the problem that great amounts of spatial information of tunnel can t be stored and analyzed effectively.

This paper carries on an in-depth study on traffic safety in freeway tunnel, including traffic characteristics, distribution characteristics of traffic accidents, influence factors of traffic accidents, the identification of accident black-spots, preventive countermeasures of traffic accidents.