HOV laneHOV lane /ˌeɪtʃ əʊ ˈviː leɪn $ -oʊ-/ noun [countable] 
(high-occupancy vehicle lane) a lane on main roads that can only be used by vehicles carrying three or more passengers when there is a lot of traffic
(high-occupancy vehicle lane) a lane on main roads that can only be used by vehicles carrying three or more passengers when there is a lot of traffic