The biggest safety issues with three-wheeled all-terrain-vehicles involve the lightweight and unevenly balanced chassis. Without proper training, a three-wheeled ATV rider can roll over while cornering at high speed or even flip while climbing a steep incline, risking serious injury.
The front of a three-wheeled ATV is lighter and much narrower than the back. This can cause a loss of traction for the front tire when the vehicle experiences high torque or undertakes steep grades. Further, the rider must lean while cornering at higher speeds or risk rolling the vehicle due to the narrow surface area of the front wheel and imbalanced traction of the rear tires. Proper training can mitigate these safety issues, but three-wheeled ATVs remain unpopular in the United States.
In 1988, a 10-year safety ban ceased production and purchase of three-wheeled ATVs in the United States. When the ban expired in 1998, many manufacturers chose not to produce new three-wheeled ATVs. In 2008, the Consumer Product Safety Commission passed the Consumer Product Safety Improvement Act, which initiated a permanent ban on import of three-wheeled ATVs to the United States. It is legal to produce three-wheeled ATVs in the United States, but no manufacturers do so as of 2015.