Driving through the Northbridge Tunnel

When making your way through the tunnel:

• Turn your headlights on
• Keep a safe distance between the vehicle in front of you
• Avoid unnecessary lane changing
• Observe all signage
• Stay alert

Key features

Safety features were the top priority in the design of the tunnel. These are a few you may see while driving.

Lane Use Management Signals

• These are individual LED signs over each lane, which are used to close lanes in the event of an accident or breakdown.
• A red "X" means the lane is closed. Exit the lane as soon as possible.
• Flashing yellow means proceed with caution.
• A green arrow means the lane is open.
• A number on a red background is the speed limit.
• A white arrow pointing to another lane means change lanes where indicated.

Closed Circuit TV (CCTV)

• Tunnel operators monitor drivers 24 hours a day.

Public Address (PA) and Radio Rebroadcast system

• Tunnel operators can communicate with drivers in the tunnel.

Emergency Bays

• These are located at the tunnel entry and exit points.

Variable Message Signs (VMS)

• Electronic signs can deliver important safety messages to drivers.

Emergency escape route

• In case of an in-tunnel emergency, there is a clearly signed escape route.

Fire suppression and ventilation system

• This ensures air quality remains well above national guidelines

What to do if you break down in the Northbridge Tunnel

There are no emergency lanes inside the Northbridge Tunnel. If you break down, stay inside your vehicle and wait for instructions via your radio, the PA, or Variable Messaging System in the tunnel. 

Know before you go

Check our Travel Map before heading for the Northbridge Tunnel. You will be able to see any incidents or closures that may be occurring at that time.

Scheduled closures are required throughout the year for maintenance works, including:

• Deluge and fire system testing
• Cleaning walls, lights and signs
• Road surface inspection
• Jet fan inspections