One Way
regulatory sign · rectangle h · white
Traffic flows only in the direction of the arrow.
- Visual breakdown
- Horizontal black rectangle with a large white arrow and the words ONE WAY.
- Shape recognition
- Long horizontal arrow sign mounted at intersections, often paired on both corners.
- Color recognition
- Black-and-white = regulatory. The arrow is the rule.
- Memory trick
- The arrow is the road's only door. You can only walk through a door the way it opens.
- Real-world example
- Downtown street grids alternate one-way directions; turning against the arrow puts you head-on into traffic.
- Common mistakes
- Turning left onto a one-way street going right, especially at night when traffic is sparse.
- Quick recall method
- Follow the arrow — it's the only legal direction.
