From the answers before you, where especially should a driver slow down?

1. Whilst driving on an inter-urban road with a built centre divider.
2. Whilst driving on an inter-urban road without a built centre divider.
3. Correct answer: At the entrance to and whilst driving through a tunnel.
4. Whilst driving on an inter-urban road.

WhyBefore a tunnel and inside it you must slow down. Your eyes need time to adjust, and there is almost no room to maneuver.