N.J. Stat. § 43:16A-26
Upon the filing of a petition signed by at least ten per centum (10%) of the legal voters of any county, municipality or political subdivision thereof with the clerk of such county, municipality or political subdivision, as the case may be, the question of the adoption of the act of which this act is an amendment and supplement shall be submitted to the voters of such county, municipality or political subdivision at the next general election succeeding the date of the filing of the petition unless such filing date shall occur within five months immediately preceding a general election, in which case it shall be submitted at the second succeeding general election. If a majority of the legal voters voting upon said question at such general election vote in favor of adoption, the act to which this act is an amendment and supplement shall take effect in such county, municipality or political subdivision thereof on January first following the date of such election. If the act is adopted at such election, the clerk of the county, municipality or political subdivision so adopting the act shall immediately notify the board of trustees of the Police and Firemen's Retirement System of New Jersey of such adoption.
N.J.S. § 43:16A-26