Under certain conditions I suspect neither one of us would prefer to contemplate, nothing whatsoever is safe. Absent those conditions, and we hope we are, it’s possible to estimate, but watch that methodology:
Which car is safest to drive, you may wonder. How will you find out? You could simply sort the number of fatal crashes by model of car and then compare the totals. The car with the fewest fatalities must be safer.
But is it? By simply sorting and counting fatalities, you have decided to ignore lots of other variables that may play a role, and according to psychology professor Richard Nisbett that means your analysis may be so flawed as to be useless. He uses the car safety study as his own example, pointing out that drivers with unsafe driving habits may gravitate towards certain automobile types and thus skew the results. If all the leadfoots (leadfeet?) suddenly switched to Volvos, that vehicle model’s safety record might be quite different than it is. And if little old ladies started buying Dodge Challengers, their record might improve. Although you might have to select out the ones from Pasadena, at least when they are driving on Colorado Boulevard.
Incidentally, the Pasadena contingent had rivals off to the east, who drove Pontiacs.