Alterations made in a highway as provided in this chapter, if made by the Transportation Board, shall be signed by it. If such alterations are agreed upon by the parties, the agreement shall be signed by the selectboard of the town (where the alteration involves a town highway) or Secretary of Transportation (where the alteration involves a State highway), and duly recorded in the town clerk's office. (Amended 1959, No. 329 (Adj. Sess.), § 39(b), eff. March 1, 1961; 1993, No. 172 (Adj. Sess.), § 50.)