From OpenStreetMap Wiki
|highway = proposed|
|For roads that are about to be built, but where any construction work hasn't yet been started.|
|Used on these elements|
|Tools for this tag|
|This tag page is a stub. You can help OpenStreetMap by expanding it.
Similar pages for structural reference: Tag:railway=tram, Tag:waterway=dock.
For roads that are about to be built, but where any construction work hasn't yet been started.
See proposed=* for more guidance.
|Note that generally, OpenStreetMap requires information to be verifiable on the ground. Proposed features that are not visible on the ground should therefore only be mapped in exceptional cases and after a discussion with the relevant OSM community, lest they might be deleted for lack of verifiability.|