(Für diese Definition ist die deutsche Übersetzung noch nicht abgeschlossen)
Control of a vehicle in two dimensions, wherein features of the surface or of the environment, like the presence of inclined planes, stairs or lifts, results in a change in the altitude or depth of the vehicle during the two dimensional control.
Control of a vehicle in two dimensions, wherein features of the surface or of the environment, like the presence of inclined planes, stairs or lifts, results in a change in the altitude or depth of the vehicle during the two dimensional control.