Hi rskedgell,  
We closely reviewed your feedback. I extended the dual carriageway between the two traffic islands to improve recognition and routing experience and felt that this edit was accommodated within this exception to the dual carriageway mapping conventions described on the OSM wiki: “If a road contains any of the non-appropriate elements for some short distance, but is still separated by a physical obstruction along other parts of the road in the vast majority of its length, then the road can continue to exist as a dual carriageway for the moment.” However, based on your feedback I will revert my edit.
I would very much appreciate your opinion on when this exception applies, so that we can make sure our future edits align with community expectations. Thank you!