Vehicle, Mobility and Transportation Design Cero electric tricycle by Tamás Túri Adult tricycles are often considered as medical devices. One of the Cero’s main goals was to remove this stigma associated with these vehicles. It not only fulfills the disabled’s needs, but the individual’s too. The tricycle's unique frame with safe low center of gravity and sturdy backrest make it the ideal mode of transportation for people with various medical conditions as well as recovering patients. With three modes, varying in level of electric assist, users can choose the type of experience they want to have each time they ride.