Yes, and interestingly they all avoided the danger that WW described. Perhaps that one is not officially recognised in case someone gets sued!

Ed.: When I think about it there is one like WW's that I use frequently, where the exit from the clockwise track of the M25 merges with the exit from the anticlockwise track before joining the southbound M23. The lanes are quite wide though, so it is not that difficult; in fact the tricky part is where the anticlockwise exit slip narrows from two lanes to one and most drivers are still doing about 80mph by that point. And jostling for position in an attempt to be first into the zipper. Good fun. Commuter driving as a competitive sport.