In order to facilitate national defense, the director is hereby authorized to cooperate with the appropriate federal agency, when requested by it, in:
1. Making of surveys, plans, specifications, and estimates for, and in the construction and maintenance of, flight strips and of roads and bridges necessary to provide access to military and naval reservations, defense industries, defense-industry sites, and sources of raw materials.2. Acquiring of land necessary for the construction of such flight strips and roads and bridges by purchase or condemnation in the manner provided by law for the purchase or condemnation of land required for state highway construction.3. Replacing existing highways and highway connections shut off from general public use at military and naval reservations and defense-industry sites.4. Entering into contracts in any manner approved by the appropriate federal agency for the construction of any such flight strips or roads.5. Performing such construction and maintenance work by force account, whether paid for in whole by federal funds or in part by federal funds and in part by funds provided by the state or any of its subdivisions.Provided, that no cooperative venture may be entered into when any funds appropriated by the legislative assembly for highway purposes are to be expended thereby, unless such expended funds are to be reimbursed from federal sources.