There are many factors involved in a motorcycle accident. These factors are complex, but there are certain patterns. Motorcycle crashes tend to occur most frequently in September and May. Fridays and Saturdays have the highest number of crashes. Approximately 67 percent of crashes happen in daylight and many crashes occur from 3 p.m. through 6 p.m. Male drivers ages 26 to 55 are most likely to suffer serious injuries and fatalities, although there has been an increase in fatalities among those ages 20 to 29.