Okla. Stat. tit. 69, § 69-654: Adoption of county primary road system

The boards of county commissioners of the various counties in

this state shall adopt a system of county highways and public roads

which shall constitute the county primary road system of their

respective counties. Said system shall consist of functionally

classified county collector routes as determined by the Department

of Transportation in cooperation with the various boards of county

commissioners and approved by the Federal Highway Administration.

In constructing and maintaining the various routes comprising

the county primary road system, county officials shall take into

consideration the relative traffic volumes existing on the various

segments of such system in the county, population, industrial and

marketing centers, and connections with improved segments of the

respective county primary road systems in adjoining counties, the

state highway system and the city street system.