Okla. Stat. tit. 19, § 19-868.10: Enforcement - Appeals - Modification

After the board of county commissioners shall have established

building or set-back lines on such major highways, no new building

or structure shall be erected within such building or set-back lines

outside the corporate limits of any city or town, and no permit for

such building shall be issued by the county engineer who is hereby

designated as the officer to administer and enforce such building or

set-back line regulations. The county board of adjustment,

hereinbefore created, shall hear appeals of any property owner

aggrieved by such building line regulations. Said board of

adjustment shall have the power to modify or vary the building or

set-back line regulations in specific cases, in order that

unwarranted hardship, which constitutes an unreasonable deprivation

of uses as distinguished from a mere grant of privilege, may be

avoided, the intended purpose of the regulations strictly observed,

and the public welfare and public safety protected.