Is anyone aware of a way to import dual-carriageway roads as a single

There's a request at Openstreetmap-carto to render dual-carriageway
roads differently at mid-zoom levels:

It doesn't appear that there are any tags in the database which hold
this information. Ideally one would import a linestring midway between
two highway ways, if they were tagged with the same highway class,
name, and oneway=yes, but it could be difficult to get this right at
locations where the two carriageways separate.

Has anyone implemented a rendering that handles dual-carriageway
roads, or designed a way to import such ways into a (rendering)
database as a single linestring midway between the two OSM ways?

- Joseph Eisenberg

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