That is a LOT scarier than I imagined!
I can see how Sarah Palin’s husband got injured doing that.
https://www.youtube.com/watch?v=Lx-DCS-vQ6c
Above is closer to what Todd Palin was doing. Snowmobile (snow machine in Alaska) racing at night. (He crashed when it was dark). Although he was doing it on an extended day cross-country race - not a track like the above video.