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.
Okla. Stat. tit. 69, § 701