Wide hatched areas are not adequate separation for a dual carriageway, which requires physical separation by a central reservation. This is the case both for OSM mapping and in law.

Even if this were really a dual carriageway, leaving the original way as a 2 lane road and adding a parallel road, neither of which are one way, would be seriously incorrect mapping.

Mapping for the renderer by adding non-existent separation and geometries is detrimental to OSM data consumers. Routing in this part of North Kent is becoming increasingly compromised, to the point that I would have to fall back to Google Maps.

Please ensure that you have read and understood the following before making further edits to major roads:
https://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer
https://wiki.openstreetmap.org/wiki/Dual_carriageway