Okla. Stat. tit. 69, § 69-701: Preparation of state design standards

The Department shall cause to be prepared state design

standards, standard plans and standard specifications for the

design, construction and maintenance of the state highways and

bridges which are not on the interstate or national highway system

within this state. Plans and specifications shall be uniform and

may be amended from time to time as the Department deems advisable.

Design standards, when adopted by the Transportation Commission and

accepted by the Federal Highway Administration, shall constitute the

current recognized design standard for such highways in this state.