Ok from time to my knees are getting sore from training, and I'm not too happy with the performance of my pedals. I'm looking at a new pair of speedplay pedals, I think the type I'm using now is spd. Anyhow my current worry about these is that if you crashed your feet wouldn't unclip and you could do some serious damage. I'm sure someone at speedplay has thought of this and they have a brilliant reason or design to avoid this problem. Someone please allay my fears and tell me why I shouldn't worry.