|highway = milestone|
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Similar pages for structural reference; Tag:railway=tram, Tag:waterway=dock
是沿著道路或邊界每隔一段距離就有標示數字的標誌，通常是一個單位（例如：1英里或1公里）偶爾會小於一個單位（例如：1.2英里或1.1公里）。一般會立於道路的兩旁或中央，在國外另有mile markers、mileposts與 mile posts（有時候縮寫為MPs）的用法。里程代表的是自起點起算的距離。
Note that although the name "milestone" may be inaccurate by modern standards if due to units shown (i.e. - kilometers, not miles) or construction material (i.e. - metal, not stone), "milestone" is still more commonly used than more technically correct terms such as.
For "modern" milestones look at
For "historic" milestones look at
The following features are based on those described in the article Proposed features/Milestones. This tag has not been approved but is widely used.
ref=* is optional, only to be used if the milestone actually has a reference number written on it.
distance=* is optional, only to be used if the milestone actually has a number being the distance from the beginning of the road/rail.
- pk=* has also been used for this purpose, but a discussion on the tagging list in May 2013 suggests distance=* is a better choice than either pk=* or kp=*.
- If no unit is explicitly given, the unit is assumed to be kilometers. To specify a different unit, add a space after the number, then the unit abbreviation (e.g., <tag k="distance" v="35.0 mi"/> ).
- Decimal numbers specified with points are allowed.