Nebraska Revised Statute 60-4,133
Person possessing commercial driver's license authorizing operation of Class A combination vehicle; rights.
Any person possessing a valid commercial driver's license authorizing the operation of a Class A combination vehicle may lawfully operate a Class A, B, or C commercial motor vehicle without a hazardous materials endorsement if such person:
(1) Is acting within the scope of his or her employment as an employee of a custom harvester operation, agrichemical business, farm retail outlet and supplier, or livestock feeder; and
(2) Is operating a service vehicle that is:
(a) Transporting diesel fuel in a quantity of one thousand gallons or less; and
(b) Clearly marked with a “flammable” or “combustible” placard, as appropriate.