Regulatory Signs 9/ 23
California

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At an intersection controlled by a "YIELD" sign, you must slow down to a speed that is reasonable for existing conditions cand stop if necessary. If you must stop, do so at a marked stop line, if it exists.

At an intersection controlled by a "STOP" sign, you must come to a complete stop and check for pedestrians and cross traffic. Yield to other traffic going through the intersection and any pedestrians crossing the street.

Signs often use symbols or pictures rather than words. Each type of sign has a special color and shape to help you easily recognize the sign at a glance. 

Regulatory Signs—Prohibitive.
Traffi c signs that prohibit certain actions or movements are red in color and increase safety by controlling the fl ow of traffic through intersections.

All regulatory devices on the road tell you to stop, proceed in a certain direction, or limit your speed.