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road tunnel 
Underground passage for a road under an obstacle, such as a river or a hill.
emergency truck
Vehicle equipped for freeing accident or fire victims and transporting them to hospital.
vehicle rest area
Area reserved for permanent parking of an emergency vehicle or temporary parking for a vehicle that has broken down or has had an accident.
roadway
Surface upon which vehicles drive.
fresh air duct
Conduit usually connected to a central ventilating station, which supplies the tunnel with fresh air through openings at the side of the roadway.
evacuation route
Fresh-air duct connected to a shelter and equipped to evacuate users in case of fire.
exhaust air duct
Conduit usually connected to a central ventilating station, which evacuates polluted or smoky air through openings along the tunnel.
safety niche
Recess for an emergency telephone and fire extinguishers.
pressurized refuge
Enclosed corridor with two doors; one cannot be opened unless the other one is closed, thus the air pressure prevents the smoke from entering.
stairs
shelter
Enclosed room, ventilated, insulated from fire and connected to the evacuation route, ensuring the users’ safety before evacuation.
emergency station
Office housing on-duty personnel responsible for communications and for first aid and fire-fighting equipment.
connecting gallery
Corridor connecting the vehicle rest area to the emergency station.
technical room
Room housing lighting, ventilation, heating and telecommunications equipment.
