設立在路旁的石頭、厚板、或較常見的各種材質柱子，用於標明兩定點之間的距離，特別是標明兩城市間的距離。此詞彙「里程碑」也可用來描述不以哩，而是以公里等其他單位作為距離測量單位的物體。Afstandpalen, zoals die langs de wegen worden geplaatst op een mijl afstand van elkaar.Stones, slabs, or pillars of any material, set by the side of a road to mark distances between one point and another; most often distances between cities. The term "milestones" does not necessarily refer only to the unit of measurement called a "mile"; it may be used to describe objects that denote measures of the kilometer or other units.