What does the sign in the image mean?
Signage: Vertical signs
The S-73b sign indicates that on a carriageway with two lanes in the same direction, two lanes merge from the right; in other words, one of them ends or joins the other on that side.
Explanation
Convergence of two lanes on a two-lane carriageway in the same direction
This sign indicates that, on a **carriageway with two lanes in the same direction**, there will be a **merging of two lanes** on one of the sides:
- **S-73a**: the two lanes **merge from the left**.
- **S-73b**: the two lanes **merge from the right**.
Its function is to **warn the driver** that one of the lanes **disappears or merges** into the other, so that they can **anticipate the lane change**, adjust their speed and facilitate the merging of vehicles.
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