Explanation: Before entering a tunnel, you should switch on your dipped headlights, as this will allow you to see and be seen. In many tunnels, it's a legal requirement. Don't wear sunglasses while you're driving in a tunnel.
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Always keep your headlights on in a tunnel.You must always keep your headlights on in a tunnel, as the law says that headlights must always be used when a vehicle is being driven in the dark or dim light, or if visibility has deteriorated due to the weather or other reasons.
This is because they often have 'wideband' transmitters inside the tunnel itself- doesn't matter what frequency you are tuned to, it will pick it up- and they use this to issue alerts, traffic warnings etc (as well as in many cases they will have multiple low powered transmitters that retransmit the actual local radio ...
People often turn down the radio when driving in crowded urban areas, looking for a specific address, or driving in dangerous conditions (such as torrential rain or during a snowstorm) because those activities require more concentration than during a typical drive.