Provisions supplemental — Powers of cities and towns

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.