When you are driving inside a tunnel which is marked with traffic sign 633:
- You should turn on the front lights.· Correct answer
- You should turn on the fog lights.
- You are permitted to change lanes.
- You are permitted to overtake other vehicles.
Explanation
When driving in a tunnel you must turn on the headlights, even during the day. This lets you see the road inside the tunnel and be seen by other vehicles. In a tunnel it is generally forbidden to change lanes and forbidden to overtake, unless a sign permits it.
How to approach it
Tunnel = headlights always
tunnelheadlights633
Common mistake
Some believe that fog lights are suitable for a tunnel, but regular headlights should be used
Related signs
Want to practise more?
Practise hundreds of traffic-sign questions with smart explanations — free, no signup, no ads.
More questions on this topic
What is the meaning of the following traffic sign?✓ A path for bicycles only.
Until where does the following road sign remain valid?✓ Until the next intersection.
What is the meaning of the following traffic sign?✓ Parking for vehicles of handicapped people who have the sticker that is indicated in the sign.
What is the meaning of the following traffic signs?✓ The number of lanes on the road is increasing.
What is the meaning of the following traffic signs?✓ The number of lanes on the road is decreasing.
What is the meaning of the following traffic sign?✓ Restaurant.