Key:tracktype
 tracktype
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Provides a classification of tracks. 
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| Group: Properties |
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Status: de facto
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| Tools for this tag |
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| Wikidata |
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Usage
Tracktype is a measure of how well-maintained a track or other road is, particularly regarding surface firmness. It usually applies to highway=track but is often used for non-tracks too, especially in less-developed places where many main roads are unpaved. The proposal from which this key originates may be found at Proposed features/grade1-5. The proposal was voted on, but was standardised primarily because of its widespread use.
tracktype=* is rendered on the Standard tile layer on the main OpenStreetMap site, as an elaboration on just highway=track.
surface=* refers to surface material and sometimes to material structure. It may suggest a track type sometimes, but because the same surface material/structure can exhibit various degrees of firmness, it is still advisable to add tracktype=*.
smoothness=* in addition provides a classification scheme regarding the physical usability of a way for wheeled vehicles.
Values
See below for tag values for 'tracktype':
| Key | Value | Element | Comment | Rendering | Photo |
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| tracktype | grade1 | 
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Solid. Usually a paved or sealed surface. See  Sealed road.
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| tracktype | grade2 |
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Solid but unpaved. Usually an unpaved track with surface of gravel. See Gravel road.
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| tracktype | grade3 |
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Mostly solid. Even mixture of hard and soft materials. Almost always an unpaved track. |
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| tracktype | grade4 |
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Mostly soft. Almost always an unpaved track prominently with soil/sand/grass, but with some hard or compacted materials mixed in. |
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| tracktype | grade5 |
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Soft. Almost always an unimproved track lacking hard materials, same as surrounding soil. |
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| tracktype | <no value> |
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If no tracktype tag is present, the track is rendered with a dot-dash line style (as shown right). |  |
This table is a wiki template with a default description in English. Editable here.
Additional set of example pictures, from initial proposal
Applied to
It is primarily used in combination with highway=track (around 96% of uses) but it has also noticeable usage on highway=service, highway=path, highway=unclassified. This tag is useful to provide info about road quality, especially for unpaved roads.