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The detail that is not a requirement for a vehicle defined under commercial motor vehicle regulations is related to the weight exemption under 10,000 lbs. The Federal Motor Carrier Safety Administration (FMCSA) provides a clear definition of commercial motor vehicles based on weight and the nature of the transport operation. Vehicles that have a gross vehicle weight rating (GVWR) of 10,000 lbs or more must adhere to certain regulatory standards, particularly in relation to safety, maintenance, and operation.

The other options describe specific operational criteria that would classify a vehicle as a commercial motor vehicle. For instance, transporting hazardous materials necessitates compliance with strict safety protocols, including proper placarding. Additionally, transporting more than 16 passengers without compensation and more than 9 passengers for compensation both trigger additional regulatory scrutiny and licensing requirements. Hence, these aspects are crucial for defining what constitutes a commercial motor vehicle, while a weight exemption under 10,000 lbs does not serve as a defining criterion within these regulations.