The Commissioner of Public Safety and the Oklahoma Turnpike Authority are hereby authorized to enter into contracts and agreements for law enforcement on turnpikes. The Department of Public Safety is authorized to use any of its automotive and other equipment in policing turnpikes, and to charge the Authority for the use thereon on a rental basis to be agreed to by the Department and the Authority, and to perform such services in connection with policing turnpikes with its general personnel and equipment at such rates, salaries, expenses, and miscellaneous costs as may be agreed to by the Department and the Authority. It is the intent of this section that rental rates and other costs of policing turnpikes shall be determined on an average actual cost basis, and in accordance with salaries and expenses paid by the Department of Public Safety in its regular operations. Payments shall be made by the Authority monthly and shall be remitted to the Department of Public Safety to be credited to the Department of Public Safety Restricted Revolving Fund in the State Treasury. Such monies shall be expended for vehicles, equipment, personnel and other operating expenses for turnpike enforcement.