On a mountain pass, what does this road marking indicate?
Signage: Vertical signs
Explanation
Panel 1E on a mountain pass: black level = road closed
- Meaning: road **impassable for all vehicles**; **traffic prohibited**.
- Reason: extreme conditions (snow, ice), **rockfalls** or **roadworks** that make passage dangerous.
- Obligation: **do not continue**, turn around and use an **alternative route**.
- Context: it is the highest level of the colour code on passes (green open, yellow caution, red restrictions, **black total closure**).
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