Okla. Stat. tit. 69 § 1629
Interstate Highway 40 westbound from the Interstate Highway 35 and Interstate Highway 40 intersection to the state line shall be designated as the "Korean War Veterans Memorial Highway/Purple Heart Trail".
Interstate Highway 40 eastbound from where it intersects with Interstate Highway 44 to the state line shall be designated as the "Vietnam Veterans Memorial Highway/Purple Heart Trail".
Interstate Highway 35 southbound from the Interstate Highway 35 and Interstate Highway 40 intersection to the state line shall be designated as the "World War I Veterans Memorial Highway".
Interstate Highway 35 northbound from the Interstate Highway 35 and Interstate Highway 40 intersection to the state line shall be designated as the "World War II Veterans Memorial Highway".
Such names shall serve as an expression of the appreciation of the entire State of Oklahoma and to memorialize the men and women who served in the wars. The Department of Transportation shall cause suitable permanent markers to be placed and maintained on the highways bearing such names. Any portion of a highway in this state which is currently designated as a "Veterans Memorial Highway" shall not be renamed without legislative approval.
Okla. Stat. tit. 69, § 1629