It's a bit like peak oil; we are not noticing the big impacts yet but we have gone over the top. And that peak in car use per capita began in 2004 across the world. I don't know what was in the water that year but it started then. And US cities are now showing absolute declines in many cases, but the per capita peak happened in 2004 in Australian cities as well. It's not as though the car is disappearing but there is an end to the car dependence that we began to build from the Second World War where we essentially expanded our cities outwards, making car use absolutely necessary and increasing amounts of it every year. That has changed, that's stopped.