This sign indicates...
Signage: Vertical signs
This S-21 sign provides information about the **current traffic status** (whether it is open, restricted, or closed) of a **mountain pass or mountain section**, whose name appears at the top of the sign.
Explanation
Trafficability status on a mountain pass or stretch
Sign **S-21** indicates the **trafficability status** (whether traffic can flow normally or not) on a **mountain pass** or on a **mountain road section**.
In the **upper part of the sign**, it specifies **which particular pass or section** it refers to.
It serves to inform the driver whether that section is:
- **Open** to traffic.
- **Restricted** (for example, only with snow chains).
- **Closed** due to snow, ice, or other circumstances.
Its function is to **give advance warning** about the traffic conditions on that pass or mountain section.
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