What color are temporary signs in highway construction and work zones?

Temporary traffic-control signs in construction and work zones are orange (typically orange diamonds or rectangles with black symbols or text). Orange alerts drivers that they are approaching or within a work zone where conditions may change — lanes may shift or narrow, workers and equipment may be present, and reduced speed limits often apply. Drivers should slow down, stay alert, obey flaggers and posted work-zone speed limits (which often carry increased fines), and be ready for sudden stops. Recognizing orange as the work-zone color, distinct from the yellow used for permanent warning signs, is important construction-sign knowledge.