California's Graduated Driver Licensing (GDL) law has contributed to a significant drop in at-fault crashes involving 16-year-old drivers, according to the California Office of Traffic Safety (OTS). The 2006 law has also resulted in a 40 percent decrease in teen passenger deaths and injuries involving 16-year-old drivers.

A recent study, conducted by the Auto Club of Southern California, examined fatal and injury crashes where inexperienced teen drivers were at fault both before and after GDL took effect in January 2006. Before the new law in 2004 and 2005, the state had an average of 81.5 at-fault fatal and injury crashes among 16-year-olds between 11 p.m. and midnight. The number of fatal and injury crashes decreased to an average of 54 in 2006 and 2007 after the law took effect.

Source: Marketwatch
http://www.marketwatch.com/news/story/California-Teen-Driver-Deaths-Drop/story.aspx?guid=%7B9CBB9C06-F0F2-409D-B3C2-46F4A2A24E06%7D