Okla. Stat. tit. 17, § 17-84: Location and kind of crossing

The Corporation Commission shall have exclusive jurisdiction to

determine and prescribe the particular location of highway

crossings, for steam or electric railways, the protection required,

to order the removal of all obstructions as to view of such

crossings, to alter or abolish any such crossings, and to require,

where practicable, a separation of grade at any such crossing,

heretofore or hereafter established.