Motor vehicle crashes are by far the leading cause of death for young people in the U.S., claiming the lives of more 16, 17, and 18-year-olds than the next five leading causes of death combined: homicides, suicides, drowning, poisonings, cancer, and heart disease. There are more 18-year-old drivers involved in fatal crashes than drivers of any other single age, despite the fact that far fewer miles are driven by 18-year-olds than by, for example, 40-year-olds.  Teenage drivers are not only dangerous to themselves, either. For every teenage driver killed in a crash, two more people -- their passengers, drivers of other vehicles, and pedestrians -- also perish in their crashes.