I think it's just quite bumpy, as Kev said earlier.
I hope it never changes, racing around SO in an F08 is about the single biggest rush you can have in LFS.
Heres a short video of a Strongbow can full of water (I drank the strogbow first, didn't want to waste it) doing a backflip and landing, after being hit with a .22 air rifle in my back garden.