Okla. Stat. tit. 69, § 601.5
In order to protect the health, safety, and welfare of the children of this state, the board of county commissioners shall be authorized to enter onto private property adjoining county roads in order to perform maintenance or improvements to an existing private road when:
3. The owner of the private road agrees in writing to the necessary maintenance or improvements.
The maintenance or improvements to the private road shall be limited to the area necessary for the school bus to adequately turn around.
Laws 1999, HB 1471, c. 341, § 8, eff. November 1, 1999.