It's established practice to only split the way into a dual carriageway where there is a physical separation https://wiki.openstreetmap.org/wiki/Dual_carriageway. In this case there is just 4 lanes, 2 go forward, 2 turn right onto tho motorway,

Instead it's better to use https://wiki.openstreetmap.org/wiki/Key:change

Whether data consumers utilise that tag is up to them.

I'd consider splitting the way here just to address a router mapping for the router https://wiki.openstreetmap.org/wiki/Good_practice#Don't_map_for_the_router which isn't good practice.

I've reverted this back to the prior state.