Okla. Stat. tit. 66 § 125b
Whenever said barricading device shall be constructed or installed and maintained and operated, the public authorities having jurisdiction and control over the highway or street at such point shall erect and maintain a reflector warning sign with appropriate words thereon. If said barricading device is located at a railroad crossing, said warning shall be installed and maintained not less than four hundred (400) feet from the crossing, when said crossing is located on highways or streets where vehicular traffic is permitted to travel at speeds in excess of thirty (30) miles per hour; and not less than two hundred (200) feet from the crossing, when said crossing is located on highways or streets where vehicular traffic is permitted to travel at speeds not in excess of thirty (30) miles per hour. It shall be the duty of the driver of any vehicle, on approaching such warning sign, to place his vehicle under such control as to be able to bring such vehicle to a complete stop at a distance of not less than seventy-five (75) feet in advance of the crossing. The colliding of a vehicle with the barricading device at a crossing shall be prima facie evidence that the driver thereof did not comply with the provisions of this act, and such driver shall be deemed a reckless driver, and be subjected to the penalties provided for reckless driving under the motor vehicle laws of this state, and shall be liable for any damage done to such barricading device on account of such collision.
Okla. Stat. tit. 66, § 125b