The powers enumerated in this subchapter may be exercised by any town, city, or incorporated village notwithstanding and in addition to the existence of similar powers under a municipal charter or other provision of law. The validity or enforceability of an ordinance or rule adopted under section 2291 of this title shall not be affected by the existence of a statute, ordinance, or rule enacted or adopted under authority other than this subchapter, and relating to the same or a similar subject. (Added 1969, No. 170 (Adj. Sess.), § 9, eff. March 2, 1970.)