The tunnel has many operational and safety facilities.
Among them are emergency telephones and cameras at 100-metre (330 ft) intervals.
Fire-safety equipment includes infrared sensors, fire extinguishers, foam sprayers, and pushbutton alarms.
Emergency exits leading to a separate emergency path are located no more than 350 metres (1,150 ft) apart.
Stairways lead up to Yamate Street.
A duct running parallel to the roadway supplies fresh air and removes exhaust.
Dust-collection systems are designed to remove 80 percent of particulates from the air.

The Ohashi Junction in Meguro, connecting the tunnel to Route 3, required construction of stacked elliptical ramps 400 metres (1,300 ft) in circumference and 175 metres (574 ft) in diameter, similar in size to the National Stadium track.
For soundproofing reasons, the junction was encased in over 120,000 cubic metres (160,000 cu yd) of concrete.
The structure was used as the centerpiece of an urban planning project that includes the Meguro Sky Garden park and several high-rise condominium towers.
The tunnel has many operational and safety facilities. Among them are emergency telephones and cameras at 100-metre (330 ft) intervals. Fire-safety equipment includes infrared sensors, fire extinguishers, foam sprayers, and pushbutton alarms. Emergency exits leading to a separate emergency path are located no more than 350 metres (1,150 ft) apart. Stairways lead up to Yamate Street. A duct running parallel to the roadway supplies fresh air and removes exhaust. Dust-collection systems are designed to remove 80 percent of particulates from the air.
The Ohashi Junction in Meguro, connecting the tunnel to Route 3, required construction of stacked elliptical ramps 400 metres (1,300 ft) in circumference and 175 metres (574 ft) in diameter, similar in size to the National Stadium track. For soundproofing reasons, the junction was encased in over 120,000 cubic metres (160,000 cu yd) of concrete. The structure was used as the centerpiece of an urban planning project that includes the Meguro Sky Garden park and several high-rise condominium towers.
Yamate Tunnel