It is estimated that injury or death are the outcome in nearly 80 percent of all motorcycle accidents in the United States. Included in this startling statistic are the nearly 2,000 motorcyclists who die each year as a result of an accident and the staggering 50,000 who are injured in collisions. About 45% of fatal motorcycle accidents are single bike crashes. The most deadly injuries are head and chest injuries. Injury severity and likelihood of a fatality generally increase with speed, alcohol involvement and motorcycle size.