Children First: Adolescents' Rights (2-3)

Adolescents around the world are generally healthier today than in the past. Thanks largely to investment in early and middle childhood; those who reach their second decade have already negotiated the years of greatest mortality risks.
Accidents account for over a third of adolescents' deaths in 2004, nearly 400,000 adolescents died of intentional injuries. Many could be prevented by improving road safety, especially with large adolescent population.
Boys are more frequently casualties of road traffic accidents, and they are also more prone to injury or death from violence, whether random or organized.
In part, the vulnerability  of adolescents stem from their natural propensity  to take risks and test the boundaries  of socially acceptable behaviours, as they seek to establish an autonomous identity, they take the experiment with tobacco, alcohol and other substances  or engage in risky behaviour that can lead to injuries or long-term health problems.

From UNICEF: The State of the World's Children 2011 Report