M40?The M4 was a disaster for me on Friday, rain and accidents added a good few hours to my journey home. Depressing when at 4pm you think you should be at the border, but you are just at Birmingham.
M4 is East-West, London to Bristol and South Wales. Not a good route for travelling north, and a long time to find Birmingham, which is probably a bonus.
M40, meanwhile, is plagued with idiots, has been since it opened, and travels from London to Birmingham.
When it was opened, it suffered a collision on the first day, and has had one most days since. I try to avoid it unless absolutely necessary.