roll-on roll-off
/ˈrəʊlɒnˈrəʊlɒf/adjective
attrib.
- denoting a passenger ferry or other method of transport in which vehicles are driven directly on at the start of the voyage or journey and driven off at the end of it（客运渡船或其他运输工具）滚装滚卸的（指车辆可直接开上开下的）。