Federal and state Department of Transportation regulations require endorsements for truckers operating specific vehicles, including trucks that transport specific cargo. Endorsements are required for operating double or triple tractor-trailers, passenger vehicles caring 16 passengers or more, including the driver, tanker trucks, and vehicles hauling hazardous materials (hazmat).
CDL endorsements require additional training and testing. Common endorsements include:
H Endorsement to transport hazardous materials
N Endorsement to operate vehicles hauling liquids and gases
E Endorsement to drive vehicles designed to carry 16 or more passengers, including the driver
S Endorsement to drive school buses
T Endorsement to haul combination vehicles and double and triple trailers
X Endorsement to drive tanker trucks and vehicles hauling hazardous materials (hazmat)