Okla. Stat. tit. 47, § 47-12-229: Standards and specifications for lights on vehicles or

machinery operated by state or other government jurisdictions.

A. The Department of Transportation shall adopt standards and

specifications applicable to headlamps, clearance lamps,

identification and other lamps on snow-removal equipment, when

operated on the highways of this state in lieu of the lamps

otherwise required on motor vehicles by this chapter. Such

standards and specifications may permit the use of flashing lights

for purposes of identification on snow-removal equipment when in

service upon the highways. The standards and specifications for

lamps referred to in this section shall correlate with and, so far

as possible, conform with those approved by the American Association

of State Highway Officials.

B. It shall be unlawful to operate any snow-removal equipment

on any highway unless the lamps thereon comply with and are lighted

when and as required by the standards and specifications adopted as

provided in this section.

C. Flashing amber lights may be used on vehicles or machinery

owned or operated by any agency of the state or by any county or

city when engaged in the performance of emergency work or on the

construction or maintenance of highways.

D. Rear facing flashing red and blue lights may be used on

vehicles or machinery owned or operated by the Oklahoma Department

of Transportation, the Oklahoma Turnpike Authority, or by any county

when engaged in the performance of emergency work or on the

construction or maintenance of highways.