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City of San Mateo Municipal Code.

11.16.010 PROHIBITED LEFT TURN—SIGNS.

The City Manager may erect and maintain signs at any intersection prohibiting the making of left turns by drivers of vehicles wherever the City Manager determines that such left turns would cause traffic congestion or traffic hazard. The making of such left turns may be prohibited between certain hours of any day and permitted at other hours, in which event the same shall be plainly indicated on the signs erected by city manager.