MUTCD work zone sign reference

Sign designations, legends and minimum sizes for temporary traffic control, from Tables 6G-1, 6H-1 and 6I-1 of the MUTCD 11th Edition.

Warning signs

CodeLegendConventional roadFreeway or expresswayMinimumSection
W20-1ROAD WORK AHEAD36" × 36"48" × 48"30" × 30"6H.03
W20-2DETOUR AHEAD36" × 36"48" × 48"30" × 30"6H.04
W20-3ROAD CLOSED AHEAD36" × 36"48" × 48"30" × 30"6H.05
W20-4ONE LANE ROAD AHEAD36" × 36"48" × 48"30" × 30"6H.06
W20-5RIGHT LANE CLOSED AHEAD36" × 36"48" × 48"30" × 30"6H.07
W20-5LLEFT LANE CLOSED AHEAD36" × 36"48" × 48"30" × 30"6H.07
W20-7FLAGGER (symbol)36" × 36"48" × 48"30" × 30"6H.15
W20-7aFLAGGER AHEAD36" × 36"48" × 48"30" × 30"6H.15
W21-1WORKERS (symbol)36" × 36"48" × 48"30" × 30"6H.18
W21-1aWORKERS AHEAD36" × 36"48" × 48"30" × 30"6H.18
W21-5SHOULDER WORK36" × 36"48" × 48"30" × 30"6H.22
W21-5aSHOULDER CLOSED36" × 36"48" × 48"30" × 30"6H.22
W21-7UTILITY WORK AHEAD36" × 36"48" × 48"30" × 30"6H.24
W3-4BE PREPARED TO STOP36" × 36"48" × 48"30" × 30"6H.01
W4-2LANE ENDS (symbol)36" × 36"48" × 48"30" × 30"6H.08
W6-3TWO-WAY TRAFFIC (symbol)36" × 36"48" × 48"30" × 30"6H.16
W16-2PXX FEET24" × 18"30" × 24"6H.01

Regulatory signs

CodeLegendConventional roadFreeway or expresswayMinimumSection
R11-2ROAD CLOSED48" × 30"6G.04
R11-4ROAD CLOSED TO THRU TRAFFIC60" × 30"6G.05
R9-9SIDEWALK CLOSED24" × 12"6G.10
R9-11SIDEWALK CLOSED AHEAD CROSS HERE24" × 18"6G.10
R2-1SPEED LIMIT XX24" × 30"36" × 48"6G.08

Guide signs

CodeLegendConventional roadFreeway or expresswayMinimumSection
G20-1ROAD WORK NEXT XX MILES36" × 18"48" × 24"6H.35
G20-2END ROAD WORK36" × 18"48" × 24"6H.36
G20-4PILOT CAR FOLLOW ME36" × 18"6H.37
M4-9DETOUR30" × 24"48" × 36"6I.02

Dimensions are width × height in inches. A dash means the MUTCD size table prints no size in that column. These are minimums — table note 1 states that larger signs may be used wherever necessary for greater legibility or emphasis. MUTCD sign designs are public domain.