Motorcycle accidents occur frequently on roads and highways and often lead to serious injuries or death. According to the U.S. Department of Transportation, 15 percent of the vehicle-related fatalities in 2012 involved motorcycles, mopeds, three-wheeled motor vehicles, scooters, mini bikes, or pocket bikes. Automobile drivers often cause a large number of motorcycle crashes because they fail to notice bikers on the road. Speeding, poor weather conditions, running a red light, not using turn signals and driving while intoxicated are also typical factors in motorcycle accidents.