Abstract: The spreading apparatus has a main hopper and at least one extension hopper, each having a discharge roller for flowable material such as chippings for road surfacing. The extension hopper is mounted adjacent the main hopper and movable longitudinally to enable variation of the combined width of the hoppers. A baffle cuts off communication between the discharge roller of the extension hopper and the major part of the interior of the extension hopper over a width corresponding to the longitudinal overlap between the main hopper and the extension hopper.