SERVICE SIGN • white on blue SCHOOL SIGN • black on yellow CONSTRUCTION & MAINTENANCE SIGN black on orange GUIDE SIGN • white on green WARNING SIGN • black on yellow DO NOT ENTER SIGN • red and white 2. A white on red WRONG WAY sign may be placed further down the prohibited direction. 1. Do not proceed beyond this sign which faces traffic entering  a  ro adway or ramp in the wrong direction. 1. Warning signs alert drivers to actual or potential dangerous conditions ahead. 2. Extra caution should be observed at all warning signs. 3. Most warning signs imply a driver should decrease the speed of the vehicle. 4. Read and adjust your driving to the situation. 1. Destination, route guidance, and place names are provided to you on guide signs. 2. Pay special attention to mileage information. 1. Work in the road and temporary conditions requiring special alertness are indicated by these signs. 2. Adjust your speed and prepare for special conditions. 1. Five-sided signs warn of school areas and school crosswalks requiring reduced speed. 2. Prepare to stop for pedestrians. 1. Services for your convenience such as Gas, Phone, Food, Lodging, Rest Areas, Campgrounds and Litter Barrels may  be marked with white on blue signs.