The Commissioner of Highways may maintain all highways, bridges, and toll facilities within the boundaries of any state park established by and under the control of the Department of Conservation and Recreation. For the purpose of maintaining the highways in any such park, the Commissioner of Highways may expend funds under his control and available for expenditure upon the maintenance of highways in the secondary state highway system in the county or counties in which such state park is located. This section shall not affect the jurisdiction, control, and right to establish such highways, bridges, and toll facilities that are now vested in the Department of Conservation and Recreation. All roads, bridges, and toll facilities constructed by way of revenue bonds issued by the Department of Conservation and Recreation shall operate under the terms of their establishment as a park facility, notwithstanding the right of the Commissioner of Highways to use highway funds to maintain them.