These signs (or similar) are seen throughout San Francisco, California. A white, rectangular regulatory sign with similar wording has been proposed for approval for use state wide in California. Photo info: 20061231 allowed-full-lane-text by Jym Dyer.
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=v= Under current California state law it is true for lanes of substandard width, which means not wide enough for a bike and car to travel side-by-side, safely. This describes nearly every lane in San Francisco.