Key:dual_carriageway
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 dual_carriageway
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| Description |
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Specifies whether a highway is a dual-carriageway (divided) road 
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| Group: highways |
| Used on these elements |
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| Documented values: 2 |
| Requires |
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| Useful combination |
| See also |
| Status: in use |
| Tools for this tag |
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See Tag:dual_carriageway=yes for discussion how this tag is used.
Comparison
(can indicate different values; may be confusing for carriage=* and other *way=*.)
(may imply multiple-carriageway)
There was a less sharp uptick for carriageway=* in 2013, than the rise of dual_carriageway=* in 2014.