Where is the mandatory dipped-beam headlight sign often found?
Signage: Vertical signs
Explanation
The **low beam** or dipped beam is essential for illuminating the road without dazzling other drivers. It is mandatory in various situations, including when driving through **tunnels** during the day.
- **Tunnels**: Upon entering a tunnel, it is common to find the sign mandating the use of low beams. This is because tunnels usually have little natural lighting, making it necessary to use these lights to improve visibility and ensure safety.

Therefore, the sign mandating the use of low beams is often found at the entrance of a tunnel to remind drivers that they must turn on these lights.
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