What specific danger does this triangular traffic sign warn of?

Question

DentroTest · Accepted Answer

The official sign P-17a belongs to the group of warning signs. Its pictogram indicates that the roadway is going to be reduced in width on the right side, which requires taking extreme care and anticipating a possible change of path or lane. The lateral drop is not warned of by this sign: it is represented by P-30 (“Unprotected ledge / Lateral drop”). And an uphill section with a steep slope is indicated by sign P-16b, with its corresponding percentage of gradient.

What specific danger does this triangular traffic sign warn of?

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