Obligation to use special winter tyres
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The sign **R-412b Winter tyres** indicates the **obligation** **not to continue driving** if the vehicle **is not fitted with special winter tyres**.

These tyres can be:

- **Winter tyres** (marked M+S, 3PMSF, etc.).
- **Equivalent tyres** that serve to improve grip on snow or ice.

While this sign is in force:

- It is **forbidden to continue driving** without these tyres.
- If you do not have them, you must **stop** or **not enter** the signed area.

The key point is that the sign does not merely recommend, but **requires** the vehicle to be fitted with **special winter tyres** in order to continue driving.