Don't really even need Mister Bing to fix up some of what's gone from around here:
Comment from AndrewBuck on 23 July 2012 at 21:48
Just so you know, the way this usually happens is that an agreer creates the original way so the way and the nodes are all clean. Then a non-agreer splits the way and one part gets a new ID. This "new" way is considered dirty by the bot and it gets deleted, but since the nodes that make it up are all clean they get left.
This was done intentionally to make it easier to re-map areas where this kind of thing happened.