Heh, yes, road racing anything doesn't normally get stopped by rain (...speaking of moisture content
I had a cracker of a race at The Island when it started hailing. One of the hailstones cracked my helmet visor. They red-flagged and nullified that one, which was annoying, because I was running second.
As any race driver will say, in wet weather it's not the lack of grip which is the problem, it's the fact that you can't see.
The Road America thing looks like karts running on their kart track. We call this "sprint karting', i.e. short-circuits just for karts. I did that in the 1990's.
Superkarts is the name we give to a kart which runs on the same tracks as the cars, whether it has a gearbox or not. Just to confuse things, some sprint karts run gears- on kart tracks! They must have two sets of hands.
I know they run karts at Laguna Seca- This footage is cool because it's a very basic kart (albeit with a gearbox) similar to what you find on a small kart track, but it's running on the full circuit
Here's some onboard of exactly what I raced, in fact my teammate (I'm pictured in the opening shots
) at a track called Oran Park, just outside Sydney. Sadly, the track is no more- it's a housing estate. It was a thriller ride for our little toys. You can see the difficulty of having no gears to play with, but still the cornering speed is ridiculous. Our lap times were similar to a Porsche GT3.