Key: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
=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 =yes, but there is some usage of specific class tags:
=core=Feeder(currently tagged with title-case)=remote
United States subsets
=STRAHNET- Describes non-interstate STRAHNET routes, representing the most important non-Interstate NHS corridors.=STRAHNET_(connector)- A connector road from a STRAHNET route to a military installation or port.=Interstate- Used on Interstate highways.=Intermodal- Intermodal connectors.=Intermodal;STRAHNET_(connector)- Technically a two-value key but considered its own NHS subset.=MAP-21- A MAP-21 Principal Arterial.