"For the majority of Americans, driving or being a passenger in a motor vehicle is the most dangerous daily activity he or she will be undertaken. However, everyone can take steps to drive safely, such as avoiding the deadly 'Ds'--distracted or drunk driving. That is one of the reasons why transportation safety is a strategic priority of the U.S. Department of Transportation. According to the Centers for Disease Control, accidents (unintentional injuries) are the 5th leading cause of death in the United States. Transportation accidents account for 31.9 percent of the accidental deaths reported in 2010. Motor vehicle accidents or highway fatalities are responsible for the largest share, accounting for 93 percent of transportation‐related deaths. However, motor vehicle crashes have been trending downward, decreasing by 20.2 percent over the past 10 years, which has resulted in fewer motor vehicle fatalities and injuries. Many safety factors, including the safety measures, have contributed to this decline."
U.S. Department of Transportation Research and Innovative Technology Administration: http://www.rita.dot.gov/