That wouldn't surprise meI can't remember where I read or heard it, but iirc someone once said that you could make motorways 50 lanes wide, and most people would still cram themselves into the outside 2......
The section of M25 I mentioned is now virtually all variable speed limit. Some of the slip roads on have traffic lights and I thinks it's all pretty much all 4 lane. Rush now starts to kick in at 6.00 am.....