[dclaw]

These arguments are always idiotic. You don't need a traumatic brain injury to know that hitting your head on the ground is a problem. Helmet laws are not in fact about cars. Even riding in the middle of nowhere on the dirt can lead to an injury. Most of the world is not a city.

[mcv]

No, but cities are where most of the bikes are. Mountainbikers don't need helmet laws to know to wear one. And they usually do.