Warning signs
Tunnel ahead
What it means
A tunnel is coming up and the light will drop sharply as you go in. Take your sunglasses off before you enter, switch on dipped headlights, and leave a bigger gap than usual. Your eyes need a moment to adjust, so you may not pick up brake lights in front of you straight away.
Test yourself on signs like this one
Free with an account. Each answer tells you what the sign means, not just whether you were right.
