passing lane
noun🔊/ˈpæsɪŋ leɪn/
🔊/ˈpæsɪŋ leɪn/
(North American English) (British English outside lane)
the part of a major road such as a motorway or interstate nearest the middle of the road, where vehicles drive fastest and can go past vehicles ahead （高速公路等靠近路中央的）超车车道，快车道