What does the arrow on the sign indicate?
Signage: Vertical signs
The arrow on this sign indicates the exact side on which vehicles must pass an obstacle, establishing a mandatory direction of travel and not a mere recommendation.
Explanation
Mandatory direction of travel next to an obstacle
Sign R-401a/b indicates **mandatory passage**.
The **arrow** marks the **exact side** on which vehicles **must pass** when there is a:
- **Pedestrian refuge**
- **Traffic island**
- **Obstacle** on the carriageway
If the arrow points to the right, you must pass **to the right** of the obstacle; if it points to the left, you must pass **to the left**. It is not a recommendation, but a **mandatory** rule of circulation.
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