SDCL § 31-28-12: Markings on highways under commissioners' jurisdiction--Distances between third class municipalities--Cost of markings.

Each board of county commissioners shall erect and maintain substantial guideposts at convenient intervals along all public highways under its jurisdiction not within the boundaries of any municipality, which guideposts shall show in plain letters thereon the directions and distances to the next municipality on either side of the point where such guidepost is located. The cost of erecting such guideposts shall be paid from the county general fund.