sentences:  The route becomes a divided highway, crossing under a line of the Long Island Rail Road just west of the hamlet of Medford.Just north of the tracks, CR 83 crosses into an at-grade interchange with Long Island Avenue, which parallels the tracks.CR 83 continues north along North Ocean Avenue as a four-lane highway through Brookhaven, reaching a junction with Express Drive South, marking an interchange with the Long Island Expressway (I-495; exit 63).