HOV, or High Occupancy Vehicle, is a term used to describe vehicles that have multiple occupants, typically two or more. Synonyms for HOV include carpool lane, diamond lane, shared-use lane, and commuting lane. These lanes are commonly found on highways and are reserved for vehicles with a designated number of occupants during peak traffic hours. Other terms related to HOV include ridesharing, carpooling, and vanpooling, which are sustainable transit options that reduce single-occupancy vehicles on the road. The use of HOV lanes and these other transit options can help to reduce traffic congestion and air pollution while also saving money on fuel costs.