One of the major hazards faced by highway tunnels is fire, such as accident collision, vehicle spontaneous combustion and transportation of dangerous goods etc. All of these may lead to a tunnel fire. The traffic tunnel is complex. The environment is relatively closed, once the fire occurs, the temperature will rise sharply, accompanied by smoke. The fire extinction and personnel rescue is very difficult. It is easy to cause heavy casualties and property losses if handled inappropriately.

 Part of cases: