Section 22. Seven days at least prior to the laying out, relocation or alteration of a town way or private way a written notice of the intention of the selectmen or road commissioners of the town to lay out, relocate or alter the same shall be left by them, at the usual place of abode of the owners of the land which will be taken for such purpose, or delivered to such owner in person or to his tenant or authorized agent. If the owner has no such place of abode in the town and no tenant or authorized agent therein known to the selectmen or if, being a resident in the town, he is not known as such to the selectmen or road commissioners, such notice shall be posted in a public place in the town seven days at least before the laying out, relocation or alteration of such way. This section shall not apply to cities.