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Driver Licensing > Commercial Driver License > Classifications and Endorsements

CDL Classifications

The following CDL classifications are based on the Gross Vehicle Weight Rating (GVWR) of the vehicle being driven. Each class description includes a list of the minimum tests required to obtain that class of license in New Hampshire.

  • Class A: Any combination of vehicles with a GVWR of 26,001 or more pounds provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds. Tests required for a Class A license in New Hampshire:
    • General CDL Knowledge Test.
    • Combinations Knowledge Test.
    • Air Brakes Knowledge Test.
    • Road Skills Test in a Class A vehicle.
  • Class B: Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR. Tests required for a Class B license in New Hampshire:
    • General CDL Knowledge Test.
    • Air Brakes Knowledge Test.
    • Road Skills Test in a Class B vehicle.
  • Class C: Any single vehicle, or combination of vehicles, that does not meet the definition of Class A or Class B, but is either designed to transport 16 or more passengers, including the driver, is required to be placarded for hazardous materials or meets the definition of a "tank" vehicle. Required for a Class B license in New Hampshire:
    • General CDL Knowledge Test.
    • Completion of all requirements for one of the following endorsements:
      • Passenger Endorsement.
      • Hazmat Endorsement.

CDL Endorsements

In addition to the weight-related classifications listed above, commercial drivers can apply for different endorsements based on the type of vehicle they intend to operate. Additional testing is required to obtain each of the following endorsements:

  • Hazardous Materials or Hazmat (H-endorsement): Required in order to drive any commercial vehicle which transports hazardous materials and is placarded under State or Federal regulations. To obtain or renew this endorsement drivers must pass:
  • Tank Vehicles (N-endorsement): Required to drive any commercial vehicle designed to transport liquid in a tank that is either permanently or temporarily attached to the vehicle or the chassis, or any liquid or liquefied gaseous material in a permanent tank that requires placards.
    • Tank Knowledge Test.
  • Passenger Vehicles (P-endorsement): This endorsement is required to drive any commercial vehicle designed to transport 16 or more passengers including the driver. Applicants for this endorsement must pass:
    • Passenger Transport Knowledge Test.
    • Passenger Transport Road Skills Test. Skills test must be taken in a passenger-type vehicle representative of the desired CDL class.
  • Double/Triple Trailers (T endorsement): This endorsement is needed to legally haul double or triple trailers. Although it is illegal to operate triple trailers in New Hampshire, this endorsement will allow the holder to haul a triple trailer in those states which allow such vehicles. Applicants for this endorsement must pass:
    • Doubles/Triples Knowledge Test.
  • School Bus (S endorsement): This endorsement is required to drive a school bus designed to transport 16 or more persons, including the driver. To obtain this endorsement drivers must pass:
    • School Bus Knowledge Test.
    • School Bus Road Skills Test.
    To drive a school bus in New Hampshire, drivers must also have a School Bus Certificate.

CDL Restrictions

CDL licenses can be restricted in the following ways:

  • B Restriction - Corrective Lenses are required while operating a motor vehicle.
  • C Restriction - A mechanical aid is required to operate a commercial vehicle.
  • D Restriction - A prosthetic aid is required to operate a commercial vehicle.
  • F Restriction - An outside mirror is required on the commercial vehicle.
  • G Restriction - The driver of a commercial vehicle is only allowed to operate during daylight hours.
  • K Restriction - Intrastate Only: Drivers are authorized to drive a commercial vehicle within the state of New Hampshire only. This restriction applies to any holder of a New Hampshire CDL license who is under 21 years old.
  • L Restriction - Air Brakes: Drivers are restricted from operating a commercial vehicle with air brakes. This restriction is issued when a driver either fails the air brake component of the general knowledge test or performs the road skills test in a vehicle not equipped with air brakes.
  • M Restriction - CDL-A holders may operate CDL-B school buses only.
  • N Restriction - CDL-A and CDL-B holders may operate CDL-C school buses only.
  • O Restriction - Except Tractor Trailers: Driver limited to pintail hook trailers only.
  • T Restriction - 60-day temporary license.
  • Z Restriction - Alcohol Interlock Device required in the commercial vehicle.

For more information on CDL classifications, endorsements and restrictions, you may either download a copy of the Commercial Driver Manual Adobe Acrobat Reader Symbol or pick one up at any DMV office.

Adobe Acrobat Reader Symbol Adobe Acrobat Reader format. You can download a free reader from Adobe.


New Hampshire Division of Motor Vehicles | 23 Hazen Drive | Concord, NH 03305
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