Okla. Stat. tit. 47, § 47-15-106: Local traffic-control devices

(a) Local authorities in their respective jurisdictions shall

place and maintain such traffic-control devices upon highways under

their jurisdiction as they may deem necessary to indicate and to

carry out the provisions of this act or local traffic ordinances or

to regulate, warn or guide traffic. All such traffic-control

devices hereafter erected shall conform to the state manual and

specifications.

(b) Local authorities in exercising those functions referred to

in the preceding paragraph with regard to streets and highways which

are a continuation of state or federal numbered highways shall be

subject to the direction and control of the State Highway

Commission.