Sorry, and why do you think that the separated roads don't fit there? As far as I can see in the photos provided by Lyft in the #163861281 changeset comments, there is definitely a concrete median, and the divided road better reflects the reality on the ground. IDK if there were other errors made by Lyft, but I'd say it would be better to fix those rather than merge the roads again and introduce possible routing issues with left turns to adjacent minor driveways (like w163861281)