What type of danger does this triangular traffic sign warn of?

Question

DentroTest · Accepted Answer

The sign shown is P-16b, “Steep hill upwards”: it warns of the proximity of a road section with a steep upward gradient, and the figure inside it indicates the incline as a percentage (for example, 10% means a rise of 10 meters for every 100 meters of horizontal distance). Its equivalent for descents is P-16a, “Steep hill downwards”. Saying that it warns of a road surface in poor condition is a mistake: that is signaled by P-15, “Uneven road profile”. And saying that it warns of a lateral drop is also a mistake: that danger is signaled by P-30, “Unprotected ledge / Lateral drop”.

What type of danger does this triangular traffic sign warn of?

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