Okla. Stat. tit. 47, § 47-1-108.1: Tillerman

"Tillerman" shall mean every person who is physically located on

a Class A, B or C commercial motor vehicle in which they are

steering or assisting in steering by remote control or other means,

any axle, including a vehicle being towed by a motor vehicle, and

shall possess the appropriate class of license for the vehicle being

operated as required by Section 6-101 of Title 47 of the Oklahoma

Statutes.