According to the National Transportation Safety Board, traffic crashes are the leading cause of death for teenagers, and multiple studies have shown that graduated driver’s license (GDL) laws are effective in improving teen driving safety.

The National Transportation Safety Board (NTSB) today updated the status of its list of most wanted safety improvements that state governments can make. The list includes requiring booster seats for young children, primary seat belt laws, graduated licensing laws for young drivers, hard core drinking driver program elements, cell phone use restrictions for young drivers and passenger restriction laws for teen drivers. The NTSB also added a new issue area they’re now tracking: motorcycle safety and helmet laws. While a handful of states have made significant progress in adopting laws in all these areas, many states have not yet adopted them despite their proven ability to save lives, the NTSB reported.