Well, if you believe this site:
http://www.func-junc.co.uk/

Car ownership will be 100% (not sure about letting all those toddlers
loose in cars) and road capacity will be 3x higher.

The one problem I can't quite work out is - if all roads go over and
under each other, how on earth do you turn left or right?!

--
Dave Arquati
Imperial College, SW7
www.alwaystouchout.com - Transport projects in London