Bus standards refer to the guidelines and specifications that govern the design, construction, and operation of buses. These standards ensure safety, accessibility, and efficiency in public transportation. They cover various aspects, including vehicle dimensions, engine performance, and safety features like seat belts and emergency exits. In many regions, bus standards are set by organizations such as the American Public Transportation Association (APTA) or the European Committee for Standardization (CEN). Compliance with these standards helps maintain a consistent level of quality and reliability in bus services, benefiting both passengers and operators.