Over here in Oz we have a heap of circular shallow banked tracks built around the perimeter of sports ovals. I really think that is why we haven't suffered the same fate as the US with losing so many facilities. They're easy to maintain and easy for the public to use. The track provides a great surface away from traffic and walkers and runners for all comers to ride. Heaps of older riders and young kids use it. Trying to train on a nice winter's day is a flop because the public also likes to get out and take advantage of the facility