What do the arrows marked on the center line of a two-way roadway warn of?

Question

DentroTest · Accepted Answer

Return arrows, located approximately on the axis of a two-way roadway and pointing to the right, announce the proximity of a solid line that entails the prohibition on driving to its left. They therefore indicate that every driver must move as soon as possible into the lane to the right of the arrow and must refrain from starting to overtake, or finish as soon as possible any overtaking already begun (Annex I of the General Traffic Regulations, road markings). The proximity of a dangerous curve to the right is not warned of with these arrows, but with vertical warning signs (such as P-13a or P-14a). Nor do they indicate the mandatory direction at the next intersection: lane selection arrows are placed inside each lane before an intersection, not on the axis that separates the directions of traffic.

What do the arrows marked on the center line of a two-way roadway warn of?

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