What are the best features to look for in a handicap bike for adults?

When looking for a handicap bike for adults, the best features to consider are adjustable seat and handlebars for comfort, stable and sturdy frame for safety, easy-to-use brakes and gears, and a low step-through design for easy mounting and dismounting. Additionally, consider features such as a comfortable seat, wide tires for stability, and a lightweight frame for easier maneuverability.