Originally Posted by
wphamilton
in other words, it's about as "adequate" in car-bike collisions as it is falling off the bike, but that doesn't mean that it adequately protects you from injury in either case.
That's splitting the hair
very finely, especially in light of your claim that "The helmet is primarily for hitting the ground and that's generally going to happen regardless of how the accident occurs. Unless we're thrown up in the air we'll hit the ground with the same impact whether we're hit by a car, or riding 30 mph, or fall over at a light."