605 ILCS 5/6-513
The county board, in any county having the commission form of government in which a county unit road district is established, may issue bonds of the county in an amount not exceeding 2.875% of the value, as equalized and assessed by the Department of Revenue, of the property in such county or, until January 1, 1983, if greater, the sum that is produced by multiplying the county's 1978 equalized assessed valuation by the debt limitation percentage in effect on January 1, 1979, for the purpose of constructing county unit district roads. However, the question of issuing such county bonds shall first be submitted to the legal voters of such county at an election. The county board shall adopt a resolution to submit the question of issuing such bonds to a vote, specifying therein the particular roads or bridges to be constructed, the type of construction to be made on each section of such roads or on such bridges, the proposed widths of the roadway, together with an estimate of the cost of such construction. The county board shall certify the resolution to the proper election officials, who shall submit at an election such proposition in accordance with the general election law. Notice of the referendum shall be given and the referendum shall be held in accordance with the general election law of the State. The proposition shall be in substantially the following form:
------------------------------------------------------------------------ Shall county bonds for county YES unit district roads be issued to the ----------------------------------- amount of $....? NO ------------------------------------------------------------------------
If a majority of the voters voting on such question vote in favor of the proposition, the county board may at once issue the bonds and take the necessary steps to construct the roads provided for. Such bonds shall be issued to mature within 20 years from the date of issue, shall be upon such terms and conditions and shall bear such rate of interest not in excess of the amount permitted pursuant to "An Act to authorize public corporations to issue bonds, other evidences of indebtedness and tax anticipation warrants subject to interest rate limitations set forth therein", approved May 26, 1970, as amended, as shall be fixed by the county board. Such bonds shall be sold upon competitive bids; and the county board may, if it is of the opinion that the bids are unsatisfactory, reject the same and re-advertise and solicit other bids. At the time or before issuing any such bonds, the county board shall adopt a resolution fixing the details of such bonds and providing for the levy of a direct annual tax to pay the principal and interest on such bonds as the same become due. A register of all bonds so issued shall be kept in the office of the county clerk, and it shall be the duty of the county clerk to annually extend a tax upon all the taxable property of the county sufficient to pay the interest and principal on such bonds, as the same shall become due. Such tax shall not be subject to any limitation as to rate or amount. However, if it has been certified to the county clerk that funds from other sources have been allocated and set aside for the purpose of paying the principal or interest, or both, of such bonds, the county clerk shall, in extending the tax and fixing the rate of tax under this Section make proper allowance and reduction in such extension of tax and tax rate to the extent of the funds so certified to be available for the payment of such principal or interest, or both.
605 ILCS 5/6-513