resulting in a change of level, e.g. negotiating lifts or stairs

Full Title

Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots (drive control systems specially adapted for autonomous road vehicles B60W60/00) > Control within particular dimensions > Control of position or course in two dimensions [2D] > resulting in a change of level, e.g. negotiating lifts or stairs