A. Any person driving under a commercial Class A license shall not be required to obtain a hazardous materials endorsement pursuant to 49 C.F.R. Section 383 if the person is:
1. Acting within the scope of the license holder's employment as an employee of a custom harvester operation, agrichemical business, farm retail outlet and supplier or livestock feeder;
2. Is operating a service vehicle that is transporting diesel in a quantity of three thousand seven hundred eighty-five (3,785) liters or one thousand (1,000) gallons or less; and 3. Is clearly marked with a "flammable" or "combustible" placard as appropriate.