i once saw on a CART race at Laguna Seca a system that it seemed perfect from my point of view, it was those tyres walls, but one line of tyres separated from each other, so when the car makes the contact with the first tyre wall, it slows it down, and then the contact with the other wall will be minimum instead of stopping it to zero right away, it would need a big run off area, and after an accident like this, a few minutes to put it back together again, but i think is better instead of having serious injuries to some drivers, besides, most of the circuits in F1 have big run off areas at the high speed corners...
on the Piquet incident, i can't see how Bourdais had the fault, and i don't like Bourdais at all, but even if Bourdais had seen him, i doubt Piquet would've made the corner anyway... it was a race to forget for Nelsinho, i'm not going to say the guy is not good enough for F1, because he still have some races to prove himself, but if keeps driving like this, i fail to see him continuing in F1
good Job for Webber and Nakajima, and does anybody knows what strategy was Heikki on? he was the heavier of the top drivers it seems