Any determinations of an authority establishing a limited access facility subsequent to March 19, 1947, and prior to March 16, 1951, in connection with new highways, roads or streets, or relocated highways, roads or streets, or portions of existing highways, roads or streets which are relocated, and all acquirements of property or access rights in connection therewith are hereby validated, ratified, approved and confirmed, notwithstanding any lack of power (other than constitutional) of such authority, and notwithstanding any defects or irregularities (other than constitutional) in such proceedings.