The document specifies safety, performance and construction requirements and testing for the design and construction of powered rotary and cylinder mowers, including pedestrian controlled and ride-on (riding) types, ride-on (riding) lawn tractors, lawn and garden tractors, professional mowers, and lawn and garden tractors with moving attachments. Safe operation practices are included. The document is applicable to those mowers and tractors designed primarily for use at and around the home, as well as those mowers and tractors designed for professional (commercial) use.