What does this warning sign with a side road on the left indicate?

Question

DentroTest · Accepted Answer

The sign shown is P-1b. This sign warns of danger due to the proximity of an intersection with a road joining from the left. The crucial aspect of this sign is regarding right of way: vehicles traveling on the main road (the thick central line, i.e., you) have priority over those entering from the left (the thin line), who must yield. It should not be confused with a left turn prohibition or a dead-end street.

What does this warning sign with a side road on the left indicate?

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