" According to NHTSA, per vehicle mile traveled in 2010, motorcyclists were about 30 times more likely to die in a traffic crash than passenger car occupants. States have implemented various strategies to address the factors contributing to motorcycle crashes and fatalities, and NHTSA has assisted these efforts through guidance, grants, and research. GAO reviewed: (1) what is known about the cost of motorcycle crashes; (2) the factors that contribute to motorcycle crashes and fatalities, and strategies states are pursuing to address these factors; and (3) the extent to which NHTSA assists states in pursuing strategies that address these factors. GAO reviewed studies, analyzed documents and data from NHTSA and other sources, and interviewed officials in the U.S. Department of Transportation (DOT) and 16 states as well as representatives of various stakeholder organizations. GAO selected states that were geographically diverse and that had varying fatality rates, laws and policies, and ridership levels. "