W20 Series — Road Work Warning Signs

The W20 Series covers diamond-shaped fluorescent-orange warning signs used at the beginning of and throughout road work zones. These signs alert drivers to lane closures, road work ahead, flagger control, be-prepared-to-stop conditions, and changes in roadway geometry. The W20 Series is among the most frequently called-out sign series on California traffic control plans for utility construction, road maintenance, and public right-of-way work.