Traffic Sign Colors 13/ 17
California

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The red, white and blue shield sign indicates a highway is an interstate. These interstates are specially numbered to help motorists find their way through unfamiliar areas. A code is used to show if the route travels mainly east and west or north and south, and to show if the route is in the eastern, middle or western United States.

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.