Invalid carriages were usually single seater road vehicles, buggies, or self-propelled vehicles for disabled people. They pre-dated modern electric mobility scooters and, from the 1920s, were generally powered by small gasoline/petrol engines, although some were battery powered. They were usually designed without foot-operated controls.

A mobility scooter is an electric personal transporter used as mobility aid for people with physical impairment, mostly auxiliary to a powered wheelchair but configured like a motorscooter. When motorized they function as micromobility devices and are commonly referred to as a powered vehicle/scooter, or electric scooter. Non-motorized mobility scooters are less common, but are intended for the estimated 60% of wheelchair users who have at least some use of their legs. Whilst leg issues are commonly assumed to be the reason for using scooters, the vehicles are used by those with a wide range of conditions from spinal injuries to neurological disorders.