What does this sign indicate?
Signage: Vertical signs
This S-1 sign indicates the start of a motorway and can also mark a slip road within an interchange that leads onto it, which is why the correct option mentions both situations.
Explanation
Sign S-1: Start of motorway
The **S-1 Motorway** sign indicates the **start of a motorway**.
From this point onwards:
- The **special traffic rules** specific to motorways apply (for example, access restrictions, minimum speed, prohibition for certain slow vehicles, etc.).
- It can also indicate an **access slip road** within a road junction that **leads to a motorway**.
In short, this sign marks the place from which traffic is subject to the specific conditions of a **motorway**.
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