Okla. Stat. tit. 47, § 47-11-806.2: Reduced speed limit in toll booth zone

Where any portion of a turnpike is a properly marked toll booth

zone, as indicated with appropriate signs placed in accordance with

the latest edition of the Manual on Uniform Traffic Control Devices,

and a reduced speed limit, as properly posted shall be in effect

within the zone, no person shall drive any vehicle upon that portion

of the turnpike which is the toll booth zone in excess of the

reduced speed limit so posted. Violation of the posted reduced

speed limit in the toll booth zone shall result in the doubling of

the appropriate fine.