Okla. Stat. tit. 17, § 17-86: Extra hazardous crossings - Protective devices - Costs

The Oklahoma Corporation Commission shall have the authority,

after having made proper investigations, to designate those grade

crossings which are extra hazardous. At all such crossings so

designated, the Commission shall have the authority to order the

installation of appropriate protective devices. All such

installations to be performed by the railroad. The Commission shall

have the authority to determine the number, type, and location of

such signs, signals, gates or other protective devices, which,

however, shall conform as near as may be with generally-recognized

national standards, and said Commission shall have authority to

prescribe the division of the cost of the installation of such

signs, signals, gates or other protective devices between the public

utility and the state or its political subdivisions; provided,

however, that the cost to the utility shall be not less than ten

percent (10%) or more than twenty-five percent (25%) of the total

costs. The railroads shall be responsible for all subsequent

maintenance and cost thereof. Provided, however, that the results

of investigation or investigations, findings, determinations, or

orders of the Corporation Commission shall not be admissible in any

civil action.