Okla. Stat. tit. 47, § 47-230.17: Hazardous materials endorsement exemption for

commercial Class A license holders.

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.