One Lane Road Sign (W20-4)
The one lane road sign is a diamond and its colour is orange. It is a work zone sign. Orange means workers and equipment on the road: fines are often doubled and posted limits are mandatory.
At a glance
| Shape | diamond |
|---|---|
| Color | orange |
| Category | Work zone signs |
| MUTCD code | W20-4 |
| Legend | ONE LANE ROAD AHEAD |
How the test asks about it
- 1.
This sign means that ahead:
Not quiteCorrect answer: B — Both directions must share a single lane, alternating
Only one lane is open and traffic takes turns, usually under a flagger or pilot car. You may have to wait for oncoming traffic to clear.
Treating it as a normal merge and racing to be first is how head-on conflicts happen in work zones.
- 2.
This sign appears on a two-way road. What should you be prepared to do?
Not quiteCorrect answer: D — Give way to oncoming traffic and stop if needed before using the single open lane
Both directions of travel have to share one lane through the work area, so the traffic alternates. A flagger or a pilot vehicle usually controls whose turn it is, and your turn may mean waiting.
Reading ONE LANE ROAD as one lane in each direction. It means one lane in total, used by traffic coming both ways.
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