Traffic Sign Colors 7/ 17
California

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Yellow used with black communicates a warning.
Examples are: curve ahead, stop ahead, overhead clearances, slippery when wet. Signs which use yellow/green color with black warn about school zone activities and pedestrian activities.

Use your high-beam headlights whenever possible in open country or dark city streets, as long as it is not illegal. Do not blind other drivers with your high-beam headlights. Light from the high beams reflects off such precipitation and causes glare.