All-terrain mobility scooters include knobby tires, robust motors, and enhanced ground clearance to deal with gravel courses

https://blogfreely.net/reiddarfcp/h1-b-electric-mobility-scooter-the-history-of-electric-mobility-scooter-in

All-terrain mobility scooters add knobby tires, robust motors, and boosted ground clearance to deal with gravel courses, grass, and moderate off-road surfaces.