On a mountain pass with the road covered in snow, when is it mandatory to use chains or special winter tyres?
Safe driving
Explanation
Mandatory use of chains in mountain pass with snow
- The obligation to **use chains or winter tires** is activated when the panel on the **transitability sign** of the pass is in **red**.
- With a red panel, there is also a **prohibition** on circulation for **trucks, buses, and articulated vehicles**.
- Authorized vehicles must obey a **maximum speed of 30 km/h**.
Reason: with snow there is **low traction**, increased **braking distance**, and the risk of **losing control**. Chains or special tires **improve traction and safety**, hence their mandatory use when the sign indicates it.
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