Just letting you know there is a mapper ruining OSM just across the Dutch border.
This looks like vandalism…
http://www.openstreetmap.org/?lat=51.1225&lon=6.2813&zoom=14&layers=M
http://www.openstreetmap.org/browse/changeset/12933479
ewww. looking into that.
edit: reverted in changeset 12956586. I’ve contacted the user.
Screenshot:
I found quite often edits like this. Normally they are made with P2 which have a function to align all selected nodes into one line. I think these edits are made by exident.