Everyone needs to buckle up, but teens have the highest death rate in motor-vehicle crashes of any age group. While risky behaviors and inexperience contribute to this trend, a major reason for the high teen death rate is their failure to use seat belts. Motor-vehicle crashes are the leading cause of death for 16-to-20 year-olds in the U.S., and in 2005, 4,899 16-20 year -olds were killed in passenger-vehicles. Nearly two-thirds of those who died weren’t buckled up. (Source: NHTSA FARS)