The leading killer of American teens Motor vehicle crashes are the leading cause of death for 15- to 20-year-olds, causing roughly one-third of all deaths for this age group. Teenagers are overrepresented in traffic crashes both as drivers and as passengers. The high crash-involvement rate for this age group is caused primarily by their lack of maturity and driving experience coupled with their overconfidence and risk-taking behaviors. High-risk behaviors include failure to wear safety belts, speeding, driving while impaired (by alcohol or other drugs) and drowsy or distracted driving. This age group is particularly susceptible to distractions caused by other passengers in the vehicle, electronic devices and music.