The necessity for the condemnation or purchase of land and the improvement or widening of any state or federal highway, including the character of improvements, located in any city referred to in Kan. Stat. Ann. § 14-556, shall be determined by the governing body of any such city. No bonds shall be issued pursuant to the provisions hereof until the issuance thereof has been authorized by a majority vote of the qualified electors voting at a general city election or a special election called for that purpose, and a majority of such electors of such city shall have declared by their vote in favor of issuing such bonds.