>Curious, how many cars on the course at one time?

We started at a 2 or 3 minute interval, can't remember which. There could be 3-4 cars on course at any one time in different sections, but you aren't passing anyone at speed.

> Does track temp change much from start to finish, I don't remember seeing that much snow on the mountain when I drove up.

Yes, it can vary by 30-40+ degrees from top to base within the same run. When we came down it was ice and sleet at the summit. The base was still at almost 80 degrees I would say.

>The white blocks on shoulder of the course, can't make out what they are, are they for braking points, or what?

Anything on the side is something that racers, or spectators, put on the course. Stacked stones usually. Some people went up to put markers out, but they do not last until race day usually. There are no "official" braking markers.