Tunnels account for an increasing proportion of highways. Due to the semi-closed structure tunnels, signal communication is difficult in tunnels. This review analyzes data transmission requirements intelligent network management systems, such as lighting wind protection fire and vehicle pedestrian positioning systems The selection coverage methods are also discussed. advantages disadvantages va...

Tunnel widely exists in highway, subway and other underground buildings. Due to the structural limitations, direction of evacuation is consistent with main flow smoke tunnel. For design exhaust system, traditional methods aim at reducing overall concentration whole However, when fire hazard occurs, rapid personnel escape requires higher visibility. In this paper, a novel air supply device desig...