Okla. Stat. tit. 47, § 47-11-1005: Authorized emergency vehicles; vehicles used in

construction or maintenance of highways - Excepted from certain

provisions.

Provisions of this article shall not apply to authorized

emergency vehicles or to vehicles or machinery used in the

construction or maintenance of highways, and such vehicles or

machinery may be operated on any part of the road, whether same is

open to traffic or closed, when such operation is necessary in the

maintenance or construction of said highway; provided, that the

Department of Highways shall protect all such operations with

adequate warnings, signs, signals, lights, devices, or flagmen.