In relinquishments under section 1903 of this title, the secretary shall file the agency's certificate of relinquishment with the clerk of the town in which the relinquished highway is located and the relinquishment shall be effective on the date of the filing unless otherwise set aside or modified under section 1905 of this title. (Added 1985, No. 269 (Adj. Sess.), § 1; amended 1989, No. 246 (Adj. Sess.), § 21.)