[kazevedo]

Helmet use is an issue we take very seriously. Fortunately, safety has been excellent for US programs, but we try to make sure everyone has access to the right equipment and education. We do require users to sign a waiver saying they understand the risks. Ultimately, it comes down to culture - grabbing a helmet needs to become as natural as putting on your seatbelt or grabbing your coat.

[gregsq]

I checked up on the Australian experience, a country known for strict enforcement of helmet regulations, and found this. Perhaps you'll find it relevant.

http://www.cyclehelmets.org/1192.html

[thomasrynne]

Grabbing a helmet isn't like wearing a seat belt. The most a helmet does is reduce minor injuries. There's no evidence that they save lives.