Car accident statistics only count accidents for which the police filed a report. In many cases where there are no injuries, the police are not involved at all. I know I've been involved in several car accidents, some fairly severe, where the police made no report.
But, as mentioned before, we generally don't care about these minor accidents, and if we look solely at fatal accidents, then we can be pretty confident that we're seeing nearly all the stats there are to count.
Sorry, but that's simply not true. If we compare collected statistics for fatal car and GA accidents, we see that GA has a significant _multiple_ of the auto fatality rate.
Yes, there is. We can be confident that fatal accidents are reported, and we have several means by which to estimate activity.
-harry