All-terrain mobility scooters add knobby tires, robust motors, and boosted ground clearance to take on gravel courses

https://www.scribd.com/document/1048604194/15-Terms-Everyone-In-The-Mobility-Scooters-Industry-Should-Know-204333

All-terrain mobility scooters include knobby tires, robust motors, and boosted ground clearance to deal with gravel courses, lawn, and mild off-road surfaces.