A motor vehicle carrying at least two occupants, including the driver. An HOV could be a transit bus, vanpool, carpool, or any other vehicle that meets the minimum occupancy requirements, usually expressed as either two or more, three or more, etc., persons per vehicle.

Vehicles carrying two or more people. The number that constitutes an HOV for the purposes of HOV highway lanes may be designated differently by different transportation agencies.

Vehicles that can carry two or more persons. Examples include buses, vans and carpools.