In article ,
says...

Think, ice, 500cc 100 hp. Methanol burner, almost no suspension, no left foot peg, and only one gear but a couple hundred spikes. no brakes, all on about a 1/3 mile oval track.

Speedway racing. Jess needs to expand her horizons...

The action starts at about 2:15

http://www.youtube.com/watch?v=NBFz-eErnfM

So, that's what the do with the speed-skating track when the races are done.