Based on the premise that targeted interventions are the most effective means of preventing occupational fatalities, researchers in the United States have published a number of studies aimed at documenting risk factors for occupational MVCs in various occupations and industries. Because fatality risk is consistently highest in the truck transportation sector, the vast majority of U.S. literature on occupational road safety addresses known and hypothesized risk factors for truck drivers, including driver fatigue and hours of service,[11][12][13][14] medical conditions,[15][16][17][18] and use of mobile devices.[19][20]