1909 public laws – Ch.281 Sec.35

That each supervisor within his district shall erect and keep up at the expense of the township at the forks or cross of public roads a post and guideboard, or finger-board, containing an inscription, in legible letters, directing the way and distance to the town or towns or other public place or places situated on each road, respectively. The post and guideboard, or finger-board, aforesaid, shall be furnished to the supervisor by the board of road trustees of the proper township. The county commissioners shall cause to be set up along the highways and principal thoroughfares of the county substantial mileposts, on which are indicated the distance from the county seat; and at important crossings and forks on said highways or thoroughfares the said commissioners shall cause to be erected guideboards, on which are indicated the principal place or places to which these roads lead, and the distances to the same.