Any bus designed to transport 16 or more persons (including the driver)
Any vehicle carrying a quantity of hazardous materials which requires the display of placards in accordance with CFR49.
Any commercial single vehicle with a Gross Vehicle Weight Rating in excess of 26,000 lbs.
Any commercial combination vehicle with a Gross Combined Weight Rating of more than 26,000 lbs. when the tow vehicle exceeds a single vehicle GVWR of 26,000 lbs.
Any commercial combination vehicle with a Gross Combined Weight Rating in excess of 26,000 lbs., when the trailer has a Gross Vehicle Weight Rating of more than 10,000 lbs.
Any vehicle which meets the criteria of 3 - 5, but which falls under a category exempt from requiring a CDL, if its operation does not meet ALL of the criteria listed under that exemption (e.g, farm vehicle, military vehicle, emergency vehicle, recreational vehicle).