Commercial motor vehicle (CMV) means a motor vehicle or combination of motor vehicles used in commerce to transport passengers or property if the motor vehicle is a -
(1) Combination Vehicle (Group A) - having a gross combination weight rating or gross combination weight of 11,794 kilograms or more (26,001 pounds or more), whichever is greater, inclusive of a towed unit(s) with a gross vehicle weight rating or gross vehicle weight of more than 4,536 kilograms (10,000 pounds), whichever is greater; or
(2) Heavy Straight Vehicle (Group B) - having a gross vehicle weight rating or gross vehicle weight of 11,794 or more kilograms (26,001 pounds or more), whichever is greater; or
(3) Small Vehicle (Group C) that does not meet Group A or B requirements but that either -
(i) Is designed to transport 16 or more passengers, including the driver; or
(ii) Is of any size and is used in the transportation of hazardous materials as defined in this section.