NHTSA-NCSL Legislative Tracking Database on Traffic Safety issues

National Highway Traffic Safety Administration and National Conference of State Legislatures sponsor this utility that allows you to search traffic safety legislation by State or by issue. A very valuable feature also allows you to track over the years between 1998 and 2005.

While you're there check out the offerings on NHTSA's own site. Targeted tabs will link you through to traffic safety (including stats), vehicles & equipment, research and laws and regulations.

Also, check out NCSL's site which reports on each State's legislative matters, and links to each available State's legislative site.