National Highway Traffic Safety Administration
http://www.nhtsa.dot.gov/

The MO Department of Public Safety is comprised of nine different agencies (including two commissions) and seven separate programs all committed to ensuring the safety of the citizens of Missouri.
http://www.dps.mo.gov/home/dpshome.htm

Helmets for biking and other activities
http://www.neuroskills.com/tbi/cdcbikeintro.shtml

Bicycle Helmet Safety Institute
http://www.bhsi.org

Helmet Safety
http://www.lidsonkids.org/