Where do vertical traffic signs carry inscriptions that make them easier to understand?
Signage: Vertical signs
Explanation
**Vertical traffic signs** are plates placed on posts or structures on roads and streets to warn, oblige, prohibit, or inform drivers and pedestrians. These signs may have additional inscriptions that make them more understandable.
- **Supplementary panels**: These panels are placed **below the main signs** to provide additional information. For example, they may indicate the distance to a hazard, the duration of a prohibition, or specific conditions under which a warning applies.
- Supplementary panels are essential to clarify or specify the context of the main sign, and they are always located **below the sign** they complement.
Therefore, the inscriptions that make vertical signs more understandable are placed **below the main sign**.
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