When approaching this triangular sign with a red border, what specific danger is being warned of?

Question

DentroTest · Accepted Answer

The warning sign P-15b (Dip) indicates the proximity of a dip or concave (downward) deformation in the roadway. On two-wheeled vehicles such as mopeds, this irregularity is especially critical, since crossing it at excessive speed can cause the suspension to compress abruptly, destabilize the handlebars and cause a fall. A narrowing of the roadway is warned of with sign P-17 (Road narrowing), and a steep slope with signs P-16a (Steep hill downwards) or P-16b (Steep hill upwards), so neither of them is the one shown.

When approaching this triangular sign with a red border, what specific danger is being warned of?

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