According to the National Highway Traffic Safety Administration (NHTSA), teenagers are more likely to be involved in a motor vehicle accident than any other age group. Constituting only ~7% of the US driving population, they account for a whopping ~14% of national MVA fatalities....in fact, its the leading cause (35%) of death for 15-20-year-olds.

More citations:
http://www.schneiderchildrenshospital.org/peds_html_fixed/peds/adolescent/teenage.htm
http://www.drivehomesafe.com/teen_driving_fatality_information_start_page.htm
http://www.tell-my-mom.com/Statistics.htm
http://www.travelerspc.com/personal/auto/auto_teentips.cfm?#statistics
http://www.teensarenotadisease.com/Summer_time_driving_dangerous.htm

Hope this info puts the fear of God in him. ;-)

Mr F