On 5/4/2011 7:26 AM, Opus wrote:

In the event of getting hit with a car helmet use has little to no
effect on head injury. Bicycle helmets are designed for a 12.5 MPH
impact, in TX the statutory lowest speed limit is 30 MPH for
residential streets.

You're mistakenly assuming that should your bicycle be struck by a
vehicle moving at 30MPH that your head will hit the ground at 30MPH.
You're also mistakenly assuming that even if you did hit the ground at
30MPH that there would be no difference in the severity of injuries with
or without a helmet.