1. A. No person shall drive a vehicle over any bridge or other elevated structure constituting a part of a highway at a speed which is greater than the maximum speed which can be maintained with safety to the bridge or structure, when the structure is signposted as provided in this section.
2. B. The Oklahoma Department of Transportation and local authorities may conduct an investigation of any bridge or other elevated structure constituting a part of a highway, and if they shall thereupon find that the structure cannot, with safety to itself, withstand vehicles driving at speeds otherwise permissible under this act, they shall determine and declare the maximum speed of vehicles which the structure can safely withstand, and may cause and permit suitable signs stating the maximum speed to be erected and maintained at a distance of one hundred feet before each end of the structure.
3. C. Where any state or federal highway shall be under construction or repair or a detour shall have been designated by reason of construction or repairs in progress and the Oklahoma Department of Transportation shall have determined a maximum safe, careful and prudent speed on the highway or detour during the period of the construction or repairs and shall have plainly posted at each terminus thereof and at not less than each half mile along the route thereof the determined maximum speed, no person shall drive any vehicle upon the portion of the highway or upon the detour at a speed in excess of the speed so determined and posted. Violation of the posted speed limit in the maintenance or construction zone shall result in the doubling of the appropriate fine. For purposes of this section, "maintenance or construction zone" means any location where maintenance or construction work is actually in progress and workers present.
4. D. Upon the trial of any person charged with a violation of this section, proof of the determination of the maximum speed by the Department of Transportation and the existence of the signs shall constitute conclusive evidence of the maximum speed which can be maintained with safety as provided in subsections B and C of this section.

Laws 1961, HB 556, p. 385, § 11-806, eff. September 1, 1961; Amended by Laws 1996, HB 1860, c. 127, § 1.