1. A conveyor comprising means defining a lane having a first track along which a vehicle is to be pushed, a conveyor chain having a forward run directly below said first track, a second track below said first track, a plurality of arms, each arm having one end pivoted to said chain, a roller supported by a cantilever shaft attached at the other end of each arm, means including said arms so that each roller is movable along each of said tracks by said forward run of said chain, demand means for selectively transferring a roller from movement along the second track to movement along the first track, and said arms extending outwardly and upwardly from said chain so as to have their end portions supporting the roller in a position alongside the track along which the roller is being moved by said forward run of the chain.

5. A vehicle conveyor comprising means defining a lane having a first track at floor level and along which a tire on a vehicle is to be pushed, a second track at an elevation below the elevation of the first track and parallel thereto, a conveyor chain at an elevation below the elevation of said lane, said conveyor chain having a forward run below said first track, a plurality of arms each having one end pivotably connected to said chain at spaced points therealong, a roller supported by a cantilever shaft at the other end of each arm, demand means for selectively pivoting an arm and transferring its roller from movement along the second track to movement along the first track, each arm extending outwardly from said chain and then upwardly so as to have its said other end in a position alongside the track along which its roller is moving.