From Longman Dictionary of Contemporary Englishoverpasso‧ver‧pass /ˈəʊvəpɑːs $ ˈoʊvərpæs/ noun [countable] American Englisha structure like a bridge that allows one road to go over another roadExamples from the Corpusoverpass• The tide of red taillights ahead of them ran under an overpass and turned up an incline.• Motoristspeek as they zoom across it on bridges or freewayoverpasses.• Pauline lives in a warehouse at the far end of a San Francisco street that dead-ends under a highwayoverpass.• He loses the Greyhound in a maze of overpasses and freeway exits.• I crossed a railroadoverpass and reached a bunch of shacks where two highways forked off, both for Denver.• A train was going by on the overpass.