Dave Arquati wrote:

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

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?!

That's not the only one. I'm sure the author never tried to bike on a
2 metre wide, bi-directional bike path, for example ...

I'm also sure he never saw the prices privately owned car parks charge
e.g. in Californian cities ...

And I'm also sure he thinks he's never going to move, never going to
need something delivered or repaired, and his waste is collected by
little green men from Mars - or why did he design roads completely
useless to anything higher than a car?

.... Martin