Hi Dan,
I have reverted this changeset plus enhanced the :lanes tagging (https://wiki.openstreetmap.org/wiki/Lanes) with https://www.openstreetmap.org/changeset/155431498. Unfortunately, these tags are not visualized by iD but only by JOSM with the additional style enabled. 
Besides splitting the dual-carriage without physical separation into separate ways per directions, you also had damaged some route relation. Please, in your future edits, be careful when merging or separating roads per direction which are members of route relations.
Happy mapping and all the best,
skyper

P.S.: All four iD warnings above give a hint that something went wrong with your edits and you should try to fix them prior to saving (uploading).