In 2009, law enforcement officers in the United States reported more than 5.5 million motor vehicle crashes.¹ Although these numbers have been declining, they represent a tremendous amount of law enforcement resources dedicated to responding to and investigating these incidents. The real cost, however, is the impact on citizens and communities. These crashes resulted in 33,808 deaths and more than 2.2 million injuries.² Traffic deaths more than doubled the number of criminal homicides (15,241) that occurred in the same year.³ Law enforcement agencies have a critical role in reducing these consequences. In fact, law enforcement officers are the only people who have the authority to enforce the traffic laws that are critical to promoting appropriate and safe driving behaviors.