The contract may be executed and delivered by the unit of government upon approval by its governing body without a vote of the electors thereon, but the contract shall not become effective until the expiration of 45 days after the date of publication of such notice. If within the 45-day period a petition signed by at least 10% or 15,000, whichever is the lesser, of the registered electors residing within the limits of the unit of government is filed with the clerk thereof requesting a referendum upon the contract, the same shall not become effective until approved by the vote of a majority of the electors of the unit of government qualified to vote and voting thereon at a general or special election. Where a unit of government has, prior to the effective date of this 1974 amendment, published a resolution authorizing the execution of a contract hereunder in substantial compliance with this section, as amended, and the referendum period formerly provided by this section has expired, but the bonds have not been issued, the resolution and the publication thereof are hereby validated and, if no petition for a referendum on execution of the contract has been or is signed and filed within the time period formerly provided by this section, the contract may be executed and shall thereupon become effective without submitting the proposition for approval thereof to the electors, or if a petition has been or is so signed and filed, the contract may be executed and thereupon become effective if approved at an election as above provided. When any such contract is to be entered into by any township only on behalf of the unincorporated area of the township, only the registered electors residing within the unincorporated area of the township shall be qualified to sign the petition and vote at the election.
MCL 46.175b