The sign shown in the image may be used...
Signage: Vertical signs
Explanation
Correct use of the **carriageway narrows sign (P-17)**
Sign P-17 indicates a **danger** due to the **proximity of a section** in which the **carriageway narrows**.
- It is used when the **width decreases** in the part where vehicles travel.
- It may also be installed when **hard shoulders are reduced**, that is, when the side margins of the road become narrower.
- It **must not be used** if only the **number of lanes decreases**, but the **width of the remaining lanes and of the hard shoulders remains the same**. In that case, the carriageway is not considered to be narrowed.
In summary, this sign warns only of a **real change in the available width of the road or of its hard shoulders**, not just of a redistribution of lanes.
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