carpool lane
US /ˈkɑːr.puːl ˌleɪn/
UK /ˈkɑːr.puːl ˌleɪn/
1.
a lane on a highway reserved for vehicles carrying a specified minimum number of passengers, typically two or more, to encourage carpooling and reduce traffic congestion
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During rush hour, the carpool lane moves much faster.
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You need at least two people to use the carpool lane.