Thought I'd post this just to show what a typical track looks like loaded into Google Earth:

A bit funny looking with Google's summer data in there, but indeed we were looping around an island.
Here you can see the laptimes increasing as the ice got more slick from car after car sliding around and polishing it:

It tapers off toward the end as I caught up with lapped traffic. There's usually 30-odd cars on there at once; a lot for a < 1 mile track.