When it shall become necessary to establish a road on a county line, the inhabitants along such line may petition the board of commissioners of their respective counties for a view of said road in the manner hereinbefore provided; and it shall be the duty of the board of commissioners for each of the counties interested to act as viewers, or they may appoint three disinterested householders of the county, and they or a majority of each of them shall meet at the time and place named in the order of the county interested as in alphabetical order, together with the county surveyor of such county, and the commissioners or viewers shall assess all damages, and shall in all respects be governed by the preceding provisions of this act; and the commissioners or viewers and surveyor aforesaid shall make their report and certificate, in writing, for or against such road, which shall be filed and recorded in each of the counties as hereinbefore provided for. And when it shall become necessary to establish a road on the line of any city, the board of commissioners of the county, together with three householders appointed by the corporate authorities of such city, shall act as a board of viewers, who shall proceed as directed herein to lay off a road of the width that may be agreed upon by said commissioners and said corporate authorities, half on the side of the city and the other half on the side of the county, or the county commissioners and the viewers appointed by the corporate authorities may act separately in laying off so much of said road as lies within their respective jurisdictions; and the certificate of said commissioners in regard to said road and the survey and plat of the same shall be filed and recorded as in other cases, and said road shall be opened in the manner hereinbefore provided for.