Actually looks kind of fun. Although, I have to admit, bad experience on one when I was around 6. Made the mistake of letting my left arm fall down to relax it when it got caught between the pavement and tire at speed. Lost most of my finger nails on that hand along with some flesh! Took a while for them to grow back.
That was wild and it looked like it was here in oz. Its the first time ive seen one of those bikes with free wheeling ability, usually you have to always be pedalling.
It does look very much like the Adeaide Hills...near where i live...and there are always, Mountain Bikers, and kids on these trikes, and other tricked up creations they like to ride down hillsides on...normally dirt though, all the time....but i have never seen them on the road....