Key:minspeed
 minspeed
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Specifies the minimum speed limit on a road, railway or waterway. 
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| Group: Restrictions |
| Used on these elements |
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| Status: in use |
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| Tools for this tag |
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| Wikidata |
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This Key allows the specification of a minimum speed limit. While this information can refer to both of
- the posted minimum allowed driving speed, likely with provisions for impeding traffic volumes and situations
- the minimum speed a vehicle must at least be able to attain as defined by local law
the effective outcome for known uses (routing) is that vehicles unable of achieving the tagged speed can not and may not use the tagged section of the road.
Units are in kilometeres/hour by default. Limits in miles per hour should get a mph postfix. The knots suffix should be used for speeds specified in knots (nautical miles per hour).
Directional speeds can be specified using the minspeed:forward and minspeed:backward tags. forward refers to the speed limit in the same direction as the OSM way, whilst backward refers to the opposite direction. This is inline with maxspeed=* tag.
Example
minspeed=60 (using default units of km/h)
minspeed=60 mph (explicitly stating units as mph instead of km/h)
Lane dependent minimum speed limit
If the minimum speed limit applies only to specific lanes (see example road sign below) and not the complete highway, then the :lanes suffix can be used (see Lanes for further information).
minspeed:lanes=80|50|