A new program in Buffalo seeks to address the impulsive bad driving of some teens who suffer from ADHD:
http://www.dailyhealthreport.org/new-program-helps-adhd-teenagers-worst-drivers-on-road/1239/
and here is some research about the risks for drivers with ADHD:
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2012/03/26/MN3L1NQERS.DTL