Wow, there's rallycross in GT4?
Unfortunately, there isn't... that would actually be fun. Instead we get GT4's bastardization of "circular one-on-one stage rally"... whatever that's supposed to be.
If you're gonna pick a rally track, at least pick one that doesn't take 3 minutes per lap. I think 1 to 1.5 minute laps are a decent rule of thumb so everyone can get enough laps in without having to spend 10 hours on it.