I see these kids out on Glendora Mountain Road. They usually go down 5-7 at a time, with a follow vehicle. I actually wish they'd start higher up than the 3 miles that they do, because the guy in the follow van sweeps the rocks off of the turns with a push broom!

http://www.youtube.com/watch?v=WEAogMbQdpE

It's very cool to watch them, but I'm glad that I'm not their mama.