Used as background color for temporary traffic control signs. Means 'Construction Zone' ahead

Used as background color for warning signs and school signs signs. Means 'Caution, be alert, prepare to slow down'

Used as background color for ONE WAY, night speed limit, and truck regulatory signs, and as the color of the wording on signs with white, yellow, orange, fluorescent yellow-green backgrounds

Used as background color for most regulatory signs and some route markers, and as legend color on signs with red, green, blue, brown, and black backgrounds

Used as background color for traveler services, information signs, emergency evacuation route signs, and as part of interstate and some state route markers

Used as background color for guide and information signs, and for legend on permissive regulation and parking signs

Used as background color for pedestrian, bicycle, and school warning signs

Used as background color for guide and information signs related to points of recreational or cultural interest

Used as background color for incident management signs such as hurricane or a road closure due to a crash