No bonds shall be issued under this act until the same have been authorized by a majority of the voters of such city, voting on such proposition submitted at a general election or a special election called for that purpose by the governing body of such city. Such proposition shall specify the street, avenue or road to be improved and the amount of bonds to be issued therefor: Provided, however, That in case such proposed improvement can be made for five thousand dollars ($5,000) or less, the said proposition need not be submitted to a vote.