What does the sign in the image mean?
Signage: Vertical signs
Explanation
Lane reserved for high-occupancy vehicles (HOV)
Sign **S-51b** indicates that **one or more lanes** are reserved **exclusively** for the circulation of **high-occupancy vehicles (HOV)**.
- A vehicle is considered **high-occupancy** when it carries **at least the number of persons** indicated on the sign itself (including the driver).
- This **minimum number of occupants** is set by the **road managing authority** and may vary depending on the section or conditions.
- If the lane is reserved **in addition to HOVs** for other specific types of vehicles (for example, buses, motorcycles, etc.), the sign may **combine symbols** of those vehicles, similar to sign **S-51a**.
Only vehicles that meet the **occupancy conditions** and, where applicable, the **type of vehicle** indicated on the sign may use these lanes.
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