World wide statistics say that the age group with the most accidents are teenagers. Google it. They have not had enough life experience and maturity to handle certain situations while driving. This is why they wait until they are at a minimum 16-17 to be allowed to drive without adult supervision. Texting, talking on the phone, music, talking to their friends in the car all contribute to the reasons.

http://www.statisticstop10.com/Causes_of_Death_Older_Teens.html

http://www.cdc.gov/motorvehiclesafety/teen_drivers/teendrivers_factsheet...

http://www.teenhealthfx.com/answers/General/260.html

It's not only for your safety, it's for everyone else's safety as well. Typically you don't see full grown adults doing donuts on the roads, you see teenagers doing it.