Key:NHS
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 NHS
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| Description |
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Specifies, if the road is part of a National Highway System. 
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| Group: highways |
| Used on these elements |
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| Status: imported |
| Tools for this tag |
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Several countries have a defined National Highway System network that is independent of numbered routes. The tag is currently used in the United States and Canada.
Values
NHS=yes- normal value to indicate that the road is on the NHS, and is not an Interstate or STRAHNET route in the U.S.
Canada
The w:en:National Highway System (Canada) classifies some roads in Canada as "core" routes, "feeder" routes, and "northern" or "remote" routes. See Transport Canada's NHS page.
Most tags in Canada are simply NHS=yes, but there is some usage of specific class tags:
United States subsets
NHS=STRAHNET- Describes non-interstate STRAHNET routes, representing the most important non-Interstate NHS corridors.NHS=STRAHNET_(connector)- A connector road from a STRAHNET route to a military installation or port.NHS=Interstate- Used on Interstate highways.NHS=Intermodal- Intermodal connectors.NHS=Intermodal;STRAHNET_(connector)- Technically a two-value key but considered its own NHS subset.NHS=MAP-21- A MAP-21 Principal Arterial.