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DMV One Way

W20: Work Zones

Learn the meaning of work zones signs. Compare the pictures, read the driving guidance and follow the linked official sources.

Sign explanations are currently available in English.

Explore these signs

6 signs in this collection. Every sign’s meaning is free to read; a free account opens the full explanation. Study counts cover unique published English materials across all states; availability depends on your state and access plan.

6 signs

Road work ahead sign (W20-1)

Road work ahead

W20-1

Meaning & what to do
End detour sign (M4-8a)

End detour

M4-8a

Meaning & what to do
Reverse curve (2 lanes) sign (W1-4b)

Reverse curve (2 lanes)

W1-4b

Meaning & what to do
Reverse curve (3 lanes) sign (W1-4c)

Reverse curve (3 lanes)

W1-4c

Meaning & what to do
Flagger ahead sign (W20-7)

Flagger ahead

W20-7

Meaning & what to do
Workers sign (W21-1)

Workers

W21-1

Meaning & what to do

Sources & scope

Independent educational summaries by DMV One Way. Sign designs follow MUTCD conventions; state and local rules can add restrictions. Use your current state handbook and the signs on the road for the rules that apply to your trip.

Sources checked . Current guide illustrations: public-domain FHWA Standard Highway Signs. Historical illustrations: DMV One Way archive.