Ermm.. Trick question? Carmaggedon.
No, sorry, I lied!
It's not Carmeggeddon nom just naming it that to throw you off the scent!
Here's a clue - AFAIK it's the spiritual successor to a classic series of 'full contact' racing games with one of the most straight forward names you'll come across
I believe it's made by many of the same people as that series but for a different publisher so they had to call this one something slightly different...