Okla. Stat. tit. 47, § 47-11-301

A. Upon all roadways of sufficient width a vehicle shall be

driven upon the right half of the roadway, except as follows:

1. When overtaking and passing another vehicle proceeding in

the same direction under the laws governing such movement;

2. When an obstruction exists making it necessary to drive to

the left of the center of the highway; provided, any person so doing

shall yield the right-of-way to all vehicles traveling in the proper

direction upon the unobstructed portion of the highway within such

distance as to constitute an immediate hazard;

3. Upon a roadway divided into three marked lanes for traffic

under the laws applicable thereon;

4. Upon a roadway restricted to one-way traffic; or

5. Upon a roadway having four or more lanes for moving traffic

and providing for two-way movement of traffic.

B. Upon all roadways any vehicle proceeding at less than the

normal speed of traffic at the time and place and under the

conditions then existing shall be driven in the right-hand lane when

available for traffic, or as close as practicable to the right-hand

curb or edge of the roadway and may be temporarily driven upon the

right-hand shoulder for the purpose of permitting other vehicles to

Oklahoma Statutes - Title 47. Motor Vehicles Page 475

pass. This subsection shall not apply when overtaking and passing

another vehicle proceeding in the same direction or when preparing

for a left turn at an intersection or into a private road or

driveway.

C. Upon any roadway having four or more lanes for moving

traffic and providing for two-way movement of traffic, no vehicle

shall be driven to the left of the center line of the roadway,

except when authorized by official traffic control devices

designating certain lanes to the left side of the center of the

roadway for use by traffic not otherwise permitted to use such

lanes, or except as permitted under paragraph 2 of subsection (a) of

this section. However, this subsection shall not be construed as

prohibiting the crossing of the center line in making a left turn

into or from an alley, private road or driveway.