Contact will always happen, game glitches like when we where playing the tag game and you see floating cars (happened in the last race), one accident can cause additional people to ram in/pile up, when your forced into some positions you ram other people otherwise you will end up on the grass/wall...
Just don't see what the problem is with contact is, if contacts such an issue make a penalty rule or disable it, thats the only way I would think twice
