Before driving into a tunnel, you should:

• Ensure your vehicle is in good condition, especially check that all lights (headlights, taillights, brake lights, indicators) are working properly. This is crucial for visibility inside the often dimly lit tunnels.
• Turn on your headlights before entering the tunnel to improve your visibility and to be seen by other drivers.
• Reduce your speed gradually before entering the tunnel and maintain a safe following distance to give yourself more reaction time.
• Remove sunglasses to help your eyes adjust from bright daylight to the darker tunnel environment.
• Listen to radio traffic updates for any information about tunnel conditions.
• Obey all traffic signs, signals, and pavement markings near the tunnel entrance.
• Avoid lane changes inside the tunnel to maintain safety.
• Check that your windshield wipers are functioning and your fuel level is adequate (running out of fuel inside a tunnel is dangerous).
• Prepare your ventilation system if possible, as some tunnels have poor air quality.

If you encounter traffic stops or emergencies inside the tunnel, keep a safe distance from other vehicles, turn on hazard lights if needed, and follow emergency instructions. All these steps help ensure safety for yourself and others while driving through tunnels.