I was riding on saturday and went down on some cobblestones. I dont mean that in any way other then to say my bike went out from under me. Bruised hip, hand, shoulder and an elbow that was about an inch bigger than it normally is. To make a long story short, I did a whiplash sideways head slap onto the cobblestones. The helmet didnt crack, but left me with a headache and some scratching on my helmet. I hit pretty hard and would likely have been unconscious if I wasnt wearing a helmet.
My question is, does a nasty impact that doesnt crack the helmet cause damage that I can't see that would make the helmet unsafe. There is no give anywhere in the helmet and it feels pretty secure.
Also, I will be getting off of my bike and walking over those cobblestones in the future, unless Im absolutely positive that there has been not precipitation that day.