I am thinking about it, actually. My wife's mother died from a head injury in a car (in the 90s with no air bags). I hadn't thought about wearing a helmet in a car much until reading this, but my car is also equipped with air bags both in front of and beside me. Most of the statistics in this article were before side curtain airbags were as common, and the pie chart is from the 70s when air bags were not very common at all. So I have basically purchased a vehicle that has a lot of the helmet functionality built in. I would guess wearing a helmet with full air bags is probably more dangerous than not wearing one.