One post mentionned the risk that kerbs pose, although it wasn't phrased that way. This reminds me of the debate between car racers and racing motorcyclists. The former want to get rid of hay bales in favour of armco barriers, because of the fire risk, and the latter are horrified at this, because, duh, hay is a lot softer then steel.

Seriously, though, why is no effort directed to designing bicycle helmets that people want to wear. I understand that these horrible inverted canoe things came about because conventional helmets were too hot to wear while pedalling, but the search for a good bike helmet is far from over.