Correct answer
The existence of a section of road with a steep descending gradient.
P-16a warns of a section with a steep descending gradient. The 10% states its gradient: a vertical difference of 10 metres per 100 horizontal metres. A steep ascent has a different sign, P-16b; this image does not warn interchangeably of either direction.
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The existence of a section of road with a steep descending gradient.
The existence of a section of road with a steep ascending gradient.
The approach to a carriageway narrowing on both sides.
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Sign P-16A: a steep downhill gradient
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