On the completion of the roll, apportioning the per cent of benefits to be paid by the respective parties and municipalities, the county road commissioners or the state highway commissioner shall give notice by advertising and posting, of a review of said roll. Notice of such hearing shall be given by publishing a notice thereof, at least 2 insertions in some newspaper published and of general circulation in the county, if there is one. Such notice shall be so published at least once not less than 10 days prior to the hearing. If there is no such newspaper within the county, then the publishing of such notice will not be necessary. The county road commissioners or the state highway commissioner shall also give notice of such hearing by posting notices thereof in 5 conspicuous and public places in each township where the special assessment district is located, within the limits of said district at least 10 days prior to such hearing. They shall also serve notice of such hearing upon each township or city to be assessed, and upon the county, in case the same is operating under the county road system, at least 10 days prior to such hearing. Such notice may be served upon the clerks of the county or townships, respectively, as notice to such county or townships.