There are too many variables to conclude any of the Euro vs. US statistics. For example, as Gabe states, there are more scooters and motorcycles on the road in Europe. So I would assume that European cagers are more likely to "see" motorcyclists on the road, and yield right-of-way when appropriate. Also, aren't European drivers more highly trained than most US drivers? I know this is the case among German drivers. Having lived in Germany for three years, the Fahrschule (driving school) car is a common site on German roadways.