The provisions of §§ 39-14-1 - 39-14-14 are hereby declared to be supplementary and in addition to the provisions of other chapters of this title, and of title 31, and of §§ 39-14-15 - 39-14-23. The cities and towns may continue to exercise by ordinance all lawful authority heretofore exercised by them, not inconsistent with the express provisions of this chapter.
R.I. Gen. Laws § 39-14-14