【正确答案】Carpool In recent years, many people have begun to utilize a carpool to commute to and from work, which can not only reduce car-related expenses but also alleviate the traffic jam. In foreign countries, many cities set aside a special lane called HOV (high-occupancy vehicle) lane for this type of vehicles during the rush hours. HOV lane is a restricted traffic lane reserved at peak travel times for exclusive use of vehicles with a driver and other passengers. The normal minimum occupancy level is 2 or 3 occupants. HOV lanes are created to increase average vehicle occupancy and person throughput with the goals of reducing traffic congestion and air pollution.