Okla. Stat. tit. 47, § 47-11-305: Limitations on overtaking on the left

No vehicle shall be driven to the left side of the center of the

roadway in overtaking and passing another vehicle proceeding in the

same direction unless such left side is clearly visible and is free

of oncoming traffic for a sufficient distance ahead to permit such

overtaking and passing to be completely made without interfering

with the safe operation of any vehicle approaching from the opposite

direction or any vehicle overtaken. In every event the overtaking

vehicle must return to the righthand side of the roadway before

coming within one hundred (100) feet of any vehicle approaching from

the opposite direction.