Okla. Stat. tit. 47, § 47-11-601: Required position and method of turning at

intersections.

The driver of a vehicle intending to turn at an intersection

shall do so as follows:

1. Right turns. Both the approach for a right turn and a right

turn shall be made as close as practicable to the right-hand curb or

edge of the roadway.

2. Left turns. The driver of a vehicle intending to turn left

at an intersection shall approach the intersection in the extreme

left-hand lane lawfully available to traffic moving in the direction

of travel of such vehicle. After entering the intersection, the

left turn shall be made so as to leave the intersection, as nearly

as practicable, in the left-hand lane lawfully available to traffic

moving in such direction upon the roadway being entered. Whenever

practicable, when leaving a two-way roadway, the left turn shall be

made in that portion of the intersection to the left of the center

of the intersection.

3. Local authorities in their respective jurisdictions may

cause markers, buttons or signs to be placed within or adjacent to

intersections and thereby require and direct that a different course

from that specified in this section be traveled by vehicles turning

at an intersection, and when markers, buttons or signs are so placed

no driver of a vehicle shall turn a vehicle at an intersection other

than as directed and required by such markers, buttons or signs.