Review the development background of saturated diving emergency high pressure evacuation technology, and review the main methods and equipment for evacuation under diver pressure. Analyze the current state of high-pressure evacuation technology regulations in the world, and look forward to the application and trend of saturated high-pressure evacuation equipment and standard regulations.

The urban rail transit network command center is a comprehensive operation command and coordination organization based on each line control center, which manages the entire urban rail transit network by exercising the functions of monitoring and dispatching, emergency disposal, operation evaluation, information release, etc. This paper analyzes the key technologies of constructing the information platform of the network command center system, and discusses how to apply these technologies to various scenarios of network command management in order to promote the development of intelligent management and control of urban rail transit.

Discrete speed is an important characteristic index that affects the efficiency and safety of urban expressway. In this paper, the individual vehicle speed data collected by Shanghai license plate recognition system is used, and the vehicle speed variance is used as the characteristic index. The discrete characteristics of vehicle speed and its influencing factors are analyzed under the framework of random basic graph. Through analysis, it is found that the individual vehicle speed variance is larger than the aggregate speed variance, and the overall stability is 5~15km/h. As the density increases, it decreases slightly, and can be divided into stable, decreasing, parabolic, and clustered. The main influencing factors of vehicle speed dispersion are identified by establishing multiple linear regression models, including the number of lanes and the type of ramp. This paper expands the basic graph theory of traffic flow and has reference significance for improving the safety and efficiency of urban expressway.