Looks at helmet design and concussions. Worth reading.
http://www.bicycling.com/sites/default/files/uploads/BI-June-13-Helmet.pdf
http://www.bicycling.com/sites/default/files/uploads/BI-June-13-Helmet.pdf
In general it was focused on the need to reduce rotational forces. The current helmet test appears to mimic the woodpecker's straightline hit v.s. the twisting motion that we would see during a cycling accident. So we have a test that doesn't necessarily represent real world usage."If a bicyclist is getting more than one
or two concussions a year," he added, "he
really needs to take up another activity."