Indeed, helmets are NOT supposed to crack, as it would leave you completely unprotected for any secondary impact following the initial impact. Just common sense guys.
From the telegraph article:
"Emergency workers confirmed that his helmet had split. “When we got there, Schumacher’s helmet was broken and we saw a lot of blood,” one said."
I agree that the helmet shouldn't have cracked open and allowed the rock to penetrate and make contact with Schumachers head. The fact that there was a lot of blood reported indicates that the helmet was not designed to handle the speed Schumacher was carrying or perhaps the type of impact (with a solid object like a rock) that occured.
Better helmet standards may be needed to try and stop people from experiencing these serious but 100% preventable injuries. The best things that can be done right away is for people to understand that these helmets offer only partial protection and to slow down!
Edited by halifaxf1fan, 01 January 2014 - 17:40.