N.D. Cent. Code § 24-09-03

At each grade crossing in this state hereafter established and at each grade crossing where and when the existing crossing signs are replaced, the railway company operating the railroad thereat shall erect and maintain on the highway on each side of the railroad track or tracks, and within a distance of seventy-five feet [22.86 meters] from the nearest rail, one or more of such uniform home-crossing signs.