The road ahead splits around a median: opposing traffic will be separated. A matching "divided highway ends" sign warns when the two flows rejoin.
Keep right of the median. When the divided section ends, expect oncoming traffic back on your left and adjust your passing habits accordingly.
The two arrows curve around an island in the middle: the road is putting up a wall between directions.
At the END of a divided highway, forgetting that the left lane now belongs to oncoming cars. The rejoining is the dangerous half.
Signs that live in the same family, or get confused with this one.
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