This panel, placed below a prohibitory sign, indicates...
Signage: Vertical signs
Explanation
Panel S-821/S-820: distance and direction of a prohibition
- Under a prohibition sign, this panel indicates the **distance** over which the prohibition applies.
- The **arrow** marks the **direction** of application: to the **right** (**S-821**) or to the **left** (**S-820**).
- It complements the main sign by indicating the **affected section**, not the start or end by itself.
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