One lane road ahead sign
Traffic ahead will share one lane, often controlled by a flagger or signal.
MUTCD designation W20-4. See the federal MUTCD, page 22.
How to read signs like this
Orange means temporary traffic control: road work, detours and flaggers. Slow down, obey the flagger and watch for workers.
Practice question
What does this work zone sign tell you?
- A The left lane of a multi-lane road is closed for work ahead
- B Traffic from both directions will share a single lane
- C The road becomes one-way for the work zone
- D A narrow bridge is ahead in the work zone
Show answer
B. Traffic from both directions will share a single lane
ONE LANE ROAD means both directions must take turns using one lane. Expect a flagger, a temporary signal or a pilot car to control who goes. Wait your turn and never follow the car ahead through without a signal to go.
Source: MUTCD 11th ed., page 845
Related signs
Road work ahead
Detour ahead
Road closed ahead
Flagger ahead (symbol)
Workers (symbol)
Workers (word sign)
Shoulder work
Road work next milesAll road signs · Road sign flashcards (free)