Might as well interpret cars topographically. Any machine powered by automatic sources of kinetic motion(as opposed to manual, e.g. hand-drawn or pedaled), with at least 3 cylinders(or even spheres, at least something in which at least one cross-section through the "wheels" is a circle) touching the ground, rotating as how it is to move fowards and backwards, and can store subjects and/or objects(Including such as people and coffee cups) is a car. Therefore, stripping a car down to its wheels, engine and chassis, and add an autopilot system, a GPS, and just place a cup holder on stilts(or thin pillars, whatever you call them), that should count as a car, an auto-transport of cup(s).
Do you agree?