Okla. Stat. tit. 47, § 47-11-311: Driving on divided highways

Whenever any highway has been divided into two or more roadways

by leaving an intervening space or by a physical barrier or clearly

indicated dividing section so constructed as to impede vehicular

traffic, every vehicle shall be driven only upon the right-hand

roadway unless directed or permitted to use another roadway by

official traffic control devices or peace officers. No vehicle

shall be driven over, across or within any such dividing space,

barrier or section, except through a permanent opening in the

dividing space, barrier or section or at a permanent cross-over or

intersection as established unless specifically prohibited by public

authority. No vehicle shall be driven over, across or within any

temporary opening in a dividing space, barrier or section or at a

temporary cross-over or intersection unless specifically authorized

by a public authority or at the direction of a peace officer.