Whenever the Department of Transportation shall determine that any property previously acquired for right-of-way is not required for either right-of-way or departmental purposes, it may expressly abandon that right-of-way or property or any portion thereof, or may grant written permits to encroach thereon under such rules and regulations as the Department of Transportation may establish. Provided, no city street may be closed under this section without concurrence of the governing body of the municipality, except for interstate routes or controlled-access highways.