Tag:dual_carriageway=no
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 dual_carriageway = no
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| Description |
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Specifies that a major highway is not a dual carriageway road (divided highway), when this would normally be expected 
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| Group: highways |
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| Status: in use |
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The tag dual_carriageway=no has been rarely used to specify that a highway is a NOT dual carriageway or divided highway, even though this would have been expected due to the highway classification or tagging.
(A dual carriagway is a road with a dividing strip or barrier between the traffic in opposite directions. The carriageways in each direction may be divided by an open strip, central reservation or median of grass or bare ground, or by a barrier such as a low wall, fence or hedge.)
How to map
Add the tag dual_carriageway=yes to a single way which is tagged as a highway=trunk, highway=primary or a highway=motorway feature.
See also
- expressway=yes/no - commonly used in the United States to specify whether or not a highway is a dual carriageway "divided highway" with high-speed design features and limited access to adjacent properties or partial grade separation.
- motorroad=yes/no - specifies whether or not a highway has motorway-like access restrictions. Commonly used in parts of Europe and Japan to specify a road designed for motor vehicle use only.