Advance Warning Signs
Advance warning signs alert road users to conditions ahead in and around work zones. Browse the warning signs below for compliance guidance, or view detailed charts on the reference site.
W20-1 Road Work Ahead W20-1Road Work Ahead
Warning Signs
W20-2 Detour Ahead W20-2Detour Ahead
Warning Signs
W20-3 Road Closed Ahead W20-3Road Closed Ahead
Warning Signs
W20-4 One Lane Road Ahead W20-4One Lane Road Ahead
Warning Signs
W20-5 Lane Closed Ahead W20-5Lane Closed Ahead
Warning Signs
W20-5a Right Lane Closed Ahead W20-5aRight Lane Closed Ahead
Warning Signs
W20-5b Left Lane Closed Ahead W20-5bLeft Lane Closed Ahead
Warning Signs
W20-7 Flagger W20-7Flagger
Warning Signs
W20-1(CA) Road Work Ahead (California) W20-1(CA)Road Work Ahead (California)
Warning Signs
W20-7(CA) Flagger (California) W20-7(CA)Flagger (California)
Warning Signs
W21-1 Workers W21-1Workers
Warning Signs
W21-5 Shoulder Work W21-5Shoulder Work
Warning Signs
W21-5a Shoulder Closed W21-5aShoulder Closed
Warning Signs
W21-7 Utility Work Ahead W21-7Utility Work Ahead
Warning Signs
W3-3 Stop Ahead W3-3Stop Ahead
Warning Signs
W3-4 Be Prepared To Stop W3-4Be Prepared To Stop
Warning Signs
W4-1 Merge W4-1Merge
Warning Signs
W4-2 Lane Ends Merge Left W4-2Lane Ends Merge Left
Warning Signs
W9-2 Lane Ends W9-2Lane Ends
Warning Signs