You are leaving one-way comfort: oncoming traffic will now share this road. Common where divided highways or one-way streets end.
Stay right of the center line and recalibrate your passing: the left lane is no longer yours by default.
Two arrows pointing past each other: the road now has a "them" direction.
Passing on the left out of one-way habit. The first oncoming car after a one-way stretch is the one drivers never expect.
Signs that live in the same family, or get confused with this one.
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