What type of vertical sign is the mandatory snow chains sign?
Signage: Vertical signs
Explanation
The **mandatory snow chains sign** is a **mandatory sign**. This type of sign indicates actions that drivers must comply with obligatorily. In the case of the R-412 sign, it specifies that it is mandatory to fit chains on the vehicle's driving wheels to continue driving in snowy conditions.
**Mandatory signs** are part of the vertical signs, which are fixed on posts or structures on the road. These signs serve the purpose of **mandating or prohibiting** certain actions to ensure road safety. In this context, the mandatory chains sign ensures that vehicles have better grip on the snowy road, reducing the risk of accidents.
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