In case the Department widens or alters an existing road, or lays out a new road in any road district in connection with the construction of a State highway, or in connection with the construction of federal aid roads or such roads as are constructed with the aid of federal grants, loans, or allotments, as provided by law, and requires right-of-way for such purposes, the road district, acting through its highway commissioner, is authorized to take whatever steps may be necessary to enable such road district to aid the Department in the construction of State highways, or in connection with the construction of federal aid roads or such roads as are constructed with the aid of federal grants, loans or allotments, and the highway commissioner is authorized to pay for such rights-of-way from any available district road funds, and is authorized to issue warrants and levy a tax, or to issue bonds pursuant to referendum for the payment of such right-of-way, as is provided in Sections 6-503, 6-507, 6-509 and 6-510 of this Code.