Field Guide to American Traffic Signs:
Warning Signs
Turn
(W1-1)
1927
1935
1948
Curve
(W1-2)
1927
1935
1948
Reverse Turn
(W1-3)
1948
Reverse Curve
(W1-4)
1931
1935
1948
Winding Road
(W1-5)
1927
1948
Large Arrow
(W1-6)
1948
Large Arrow (double-headed)
(W1-7)
1948
Chevron Alignment
(W1-8)
1978
Hairpin Curve
(W1-11)
2003
270-degree Loop
(W1-15)
2003
Cross Road
(W2-1)
1927
1930
1935
1948
Side Road
(W2-2)
1927
1935
1948
Side Road (oblique)
(W2-3)
1948
T Junction
(W2-4)
1935
1948
Y Junction
(W2-5)
1948
Traffic Circle or Roundabout
(W2-6)
2000
2003
Stop Ahead
(W3-1)
1935
1948
1978
Yield Ahead
(W3-2)
1961
1978
Signal Ahead
(W3-3)
1935
1948
1961
1971
Be Prepared to Stop
(W3-4)
2003
Speed Reduction
(W3-5)
1935
1948
1961
1971
(alt.)
1978
2003
Draw Bridge
(W3-6)
1927
1948
Merging Traffic
(W4-1)
1961
1971
Added Lane
(W4-3)
1978
Lane Ends
(W4-2)
1961
1971
2003
Road Narrows
(W5-1)
1927
1948
(alt.)
1961
Narrow Bridge
(W5-2)
1927
1948
1978
One Lane Bridge
(W5-3)
1935
1948
Divided Highway
(W6-1)
1948
1961
1971
Divided Highway Ends
(W6-2)
1948
1971
Two Way Traffic
(W6-3)
1961
1971
Hill
(W7-1)
1927
(alt.)
1935
1971
Hill Blocks View
(W7-6)
2003
Bump
(W8-1)
1948
Dip
(W8-2)
1927
1935
1948
Pavement Ends
(W8-3)
1927
1935
1948
1978
Soft Shoulder
(W8-4)
1927
1935
1948
1961
Slippery When Wet
(W8-5)
1935
1948
1971
1978
2003
Loose Gravel
(W8-7)
1927
1935
1948
Rough Road
(W8-8)
1935
1948
Low Shoulder
(W8-9)
1961
No Center Stripe
(W8-12)
2003
Bridge Ices Before Road
(W8-13)
2003
Fallen Rocks
(W8-14)
1948
1961
2009
Shoulder Drop-off
(W8-17)
2009
Railroad Advance Warning
(W10-1)
1927
(Two tracks)
1935
1948
Railroad crossing in Shenandoah National Park, Virginia; circa 1940. Library of Congress photo.
Parallel Railroad Crossing
(W10-2,3,4)
1983
1983
1983
Low Ground Clearances
(W10-5)
1997
Angled Railroad Crossing
(W10-12)
2003
Bicycle Crossing
(W11-1)
1971
1999
Pedestrian Crossing
(W11-2)
1935
1948
1971
1998
2000
Deer Crossing
(W11-3)
1948
1971
2003
Cattle Crossing
(W11-4)
1948
1971
Farm Machinery
(W11-5)
1971
1997
Snowmobile Crossing
(W11-6)
1980s?
2003
Equestrian Crossing
(W11-7)
1935
1948
1980s?
Fire Station
(W11-8)
1980s?
Handicapped Crossing
(W11-9)
1980s?
2009
Truck Crossing
(W8-6,11-10)
1948
1980s?
2003
Golf Cart Crossing
(W11-11)
1997
Horse-Drawn Vehicle Crossing
(W11-14)
2003
Trail Crossing
(W11-15)
2009
Bears Crossing
(W11-16)
2009
Sheep Crossing
(W11-17)
2009
Bighorn Sheep Crossing
(W11-18)
2009
Donkey Crossing
(W11-19)
2009
Elk Crossing
(W11-20)
2009
Moose Crossing
(W11-21)
2009
Wild Horses Crossing
(W11-22)
2009
Double Arrow
(W12-1)
1930
1935
1948
1961
Low Clearance
(W12-2)
1927
1948
1971
Advisory Exit Speed
(W13-2,3)
1971
1971
Dead End
(W14-1,2)
1971
(alt.)
No Passing Zone
(W14-3)
1971
Limited Sight Distance
(W14-4)
1978
Playground
(W15-1)
1935
1948
1978
2000
Speed Hump
(W17-1)
2000
School
(S1-1)
1927
1930
1935
1948
1971
1998
School Crossing
(S2-1)
1948
1971
1998
2000
School Bus Stop Ahead
(S3-1)
1971
1998
Road Construction Ahead
(W20-1; obsolete)
1961
1971
Road Work Ahead
(W20-1)
1935
1961
1971
Detour Ahead
(W20-2)
1927
1935
1961
1971
Road Closed Ahead
(W20-3)
1961
1971
One Lane Road Ahead
(W20-4)
1961
1971
Center Lane Closed
(W9-3)
2003
Flagger Ahead
(W20-7)
1961
1971
1978
Workers
(W21-1)
1927
1935
1948
1971
1978
Fresh Oil/Tar
(W21-2)
1927
1935
1948
1971
(alt.)
Road Machinery Ahead
(W21-3)
1961
1971
Shoulder Work
(W21-5)
1961
1971
Survey Crew
(W21-6)
1961
1971
Blasting Zone Ahead
(W22-1)
1971