What does this sign mean?

When approaching a tunnel, switch on your dipped headlights. Be aware that your eyes might need to adjust to the sudden darkness. You may need to reduce your speed.

You may also be interested in these theory test questions

What does this sign mean?

What does this sign mean?

What does this sign mean?

You’re waiting at a T-junction. A vehicle is coming from the right, with its left indicator flashing. What should you do?

What information would be shown in a triangular road sign?

Which type of sign tells you not to do something?