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Available languages — Tag:highway=milestone
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Public-images-osm logo.svg highway = milestone
A stone or metal marker on the side of a road denoting the reference and distance travelled.
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasuse on relations unspecified
Useful combination
See also
Status: In use

A Wikipedia-16px.png Milestone is one of a series of numbered markers placed along a road or boundary at intervals, usually of one unit (i.e. mile or kilometer) or, occasionally, subparts of a unit. They are typically located at the side of the road or in a median. They are alternatively known as mile markers, mileposts or mile posts (sometimes abbreviated MPs). Mileage is the distance along the road from a fixed commencement point.

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 Wikipedia-16px.png Highway location marker.

Similar tags

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.

highway=milestone, waterway=milestone or railway=milestone are mandatory.

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.