What do vertical warning signs indicate when they have a yellow background?

Question

DentroTest · Accepted Answer

Vertical signs with a yellow background indicate roadworks. Specifically for warning signs (triangular), this color signals a temporary danger resulting from these works. The yellow color does not change the meaning of the sign's symbol, but it warns that the situation is provisional and requires greater attention from the driver. Remember: the yellow background signals a temporary risk (danger due to works) but mandates compliance just like a permanent sign.

What do vertical warning signs indicate when they have a yellow background?

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