The Safest Roads

An article in Wired talks about a road without signs that is shared by cars, bicycles and pedestrians. It goes on to discuss how, without much direction, it is very safe to all who traverse through it. Personally, I think that it's only safe because people pay attention; if you have someone who doesn't drive defensively then it'll be just as dangerous. Also, it doesn't say how quickly you can get thru the intersection (not really a road) now does it?