From Longman Dictionary of Contemporary Englishfast laneˈfast lane noun 1 → the fast lane2 [countable usually singular]TTR the part of a big road where people drive fastest OPP slow lane I broke down in the fast lane of the M6.
Examples from the Corpus
fast lane• I pictured a man taking leave of his motor; wobbling from the fast lane towards the hard shoulder.• They want to make life in the fast lane even faster.• It overturned in the fast lane on the twin-track road on the other side of Stowerton.• New ways of working will take taxonomy into the fast lane, providing information on species, the components of biodiversity.• One thing about driving a truck: it really is the fast lane into old age. 