To notify a driver during a travel about abnormality occurrence inside a tunnel to make the driver perform an emergency stop.

This emergency perception head 14 discharges water toward a lane inside the tunnel in an emergency perception pattern when emergency equipment inside the tunnel operates to notify the driver of a vehicle traveling inside the tunnel about the abnormality occurrence. The emergency perception head 14 includes: a head body 42 connected to a pipe supplied with pressurized fire-extinguishing water; a nozzle part 44 disposed ahead of the head body 42, and provided with a water discharge port 66 discharging the water in the emergency perception pattern; and an angle adjustment mechanism for adjusting a water discharge angle of the nozzle part 44, and fixing the nozzle part 44 in a state in which the nozzle part 44 is adjusted to an optional water discharge angle.