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A road tunnel is a covered passage that carries a road through or beneath an obstacle.

Follow the local lighting rules and traffic signs. Many countries require dipped headlights in tunnels even during daylight, while general visibility rules may also require vehicle lights.

Yes. Additional distance gives more time to react to sudden congestion, a breakdown or another hazard where escape space may be limited.

Voluntary stopping and parking are generally prohibited or strongly restricted in road tunnels. Drivers should stop only where permitted or when traffic, an emergency or another unavoidable situation requires it.

Normally this should not be done unless specifically authorised or directed by emergency or traffic-control personnel. Motorway tunnels are additionally subject to the normal motorway prohibitions on reversing and U-turns.

Keep a safe distance from the vehicle ahead, follow traffic signals and instructions and avoid blocking emergency access. Switch on hazard warning lights where appropriate to warn following traffic.

Move into an emergency bay or other safe position if possible, switch on the hazard warning lights and follow the tunnel's emergency procedures. Use an emergency telephone or contact the emergency services where necessary.

Follow the emergency signs and instructions immediately. If evacuation is necessary, leave the vehicle and use the indicated emergency exit rather than remaining in a dangerous traffic or smoke-filled area.

Emergency exits provide a route away from the traffic tunnel during incidents such as a fire. Signs may indicate the nearest exit and the direction or distance to it.

Where necessary, removing dark sunglasses before entering can help your eyes adapt more quickly to the lower light level inside the tunnel.

Yes. Tunnels may have permanent or variable speed restrictions. Drivers must follow the speed limit currently indicated.

Yes. Certain tunnels may restrict vehicles carrying dangerous goods because an incident in an enclosed space can create additional risks. Follow all applicable tunnel-category and dangerous-goods signs.