It's not so much the collision that's a 'concern' it's the death or serious injury. All road safety bodies (including Police) accept it will happen. It's accepted the State road toll will never go below about 300 per annum. If they can reduce the deaths, and from a social bottom line, the serious injury (cost of rehab, insurance, litigation) they'll be happier. That's why speed, seat belts, fatigue and distraction is the focus.
It'll always come back to economics - the real cause for every collision is too time consuming to identify. Find a common factor, sell it as the cause of death/injury, and that'll do. Otherwise it's too academic for the public to accept.
Matt

