To me at least the driving model doesn't seem to like high speeds in its current state. If the physics get fixed/modded to be more practical then road racing would be loads of fun too. The places where I think this game will excel in its current state are off road and demolition derby. Though I haven't tried any mods yet there does seem to be some fixes from the communities for this. The sedan and the sports car are extremely tail happy and the van is slow. The pickup and the hatch back are the only ones I can do anything useful with.
To me the physics make some cars unplayable. Alright, I've mucked about a little with the alpha now.