Turning around here is prohibited. The red circle and slash over the U-shaped arrow means the pictured move is illegal at this spot.
Continue to a place where turning around is legal: another intersection, a marked turn pocket, or a side street. The detour costs a minute; the U-turn costs a ticket or worse.
Red circle + slash = "not here." Whatever is under the slash is the forbidden move.
Assuming quiet traffic makes it fine. The ban exists because of what you cannot see: hidden driveways, crests, or oncoming lanes with poor sightlines.
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Q.A round sign with a red circle and a red slash through a symbol means:
A red circle with a slash means the pictured action is prohibited. For example, a slash over a turn arrow means no such turn.
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