Page 56 of the Rice Signs 2017 Traffic Safety Catalog covers rigid aluminum Work Zone Signs — the durable counterparts to the mesh roll-up signs covered on pages 40-49. The page covers the full W-series MUTCD work-zone codes: W20 Advance Work Zone signs (W20-1 Road Work Ahead, W20-4 One Lane Road Ahead, W20-5 lane closure variants, W20-7 Flagger Ahead); W21 Workers signs (W21-1 Workers Ahead, W21-3 Shoulder Work, W21-4 worker variants, W21-5 Shoulder Drop family, W21-6 Survey Crew, W21-7 Mowing, W21-8); W22 Blasting Zone signs (W22-1, W22-2, W22-3); W23 advisory signs (W23-1 Slow Traffic Ahead, W23-2 Road Work Next XX Miles); and G20 informational closure signs (G20-1, G20-2 End Road Work, G20-4). All are MUTCD-compliant orange diamonds on 0.080 aluminum with UPG or HIP reflective sheeting.