Work zone sign · MUTCD W20-4
One Lane Road Ahead
Traffic in both directions must share a single lane ahead, usually because of road work. Vehicles take turns, often under a flagger or a temporary signal.
- Shape
- Orange rectangle
- Color
- Orange background, black letters and border
What to do
Slow down and watch for oncoming vehicles or a flagger. Wait for your turn, do not enter the lane until it is clear or you are signaled, and never pass in the work area.
Where you see it
Before a work zone where two-way traffic is reduced to one lane.
Test trap
It is not "lane ends, merge": oncoming traffic also uses this lane. Do not confuse it with the yellow "Lane Ends" sign.
Memory tip: One lane, two directions: wait your turn.
Practice question
This sign means:
- The left lane ends and traffic merges right
- Two-way traffic shares one lane ahead
- Only one vehicle may use this road
- Traffic is one-way ahead
Answer: B. Traffic in both directions shares a single lane, usually in a work zone.
Road signs (MUTCD)