Motorcycle safety is the study of the risks and dangers of motorcycling, and the approaches to mitigate that risk, focusing on motorcycle design, road design and traffic rules, rider training, and the cultural attitudes of motorcyclists and other road users. Riding motorcycles on public roads carries several times the risk of riding in cars, which themselves are more risky than public conveyances like buses and trains. The human factors of motorcycle crashes are roughly equal between rider behavior and the actions of drivers sharing the roads. Technological changes, especially in the latter half of the 20th century, have made significant improvements in motorcycle safety. Serious research into motorcycle safety began in the US with the Hurt Report in 1981, followed by major studies in Europe and others. The main result of this research has been a greater emphasis on rider training and stricter licensing requirements. The US military recognized the need for their own focused motorcycle rider education in response to significant off-duty injuries of military personnel. Crash rates and risks Traveling on a motorcycle carries a much higher risk of death or injury than driving the same distance in a car. In 2006 US motorcyclists had a risk of a fatal crash that was 35 times greater than that of passenger cars, based on 390 motorcyclist deaths per billion vehicle miles and 11.1 car fatalities for that distance. In 2016 this rate was 28 times that for automobiles. When looking at all reported crashes regardless of injuries, the crash rate for motorcycles in the US in 2016 was 6.31 per million miles driven, significantly higher than the rate of 3.28 crashes per million miles driven for cars and similar vehicles. However the primary reason for the higher rates of injuries and fatalities among motorcyclists is that cars provide more effective crash protection. For automobiles, 31% of crashes result in injury but only 0.29% of accidents are fatal. For motorcycles 78.3% of reported crashes result in injury and 4.24% of crashes are fatal. Statistics from other countries confirm the US data. The UK Department for Transport indicated that motorcycles have 16 times the rate of serious injuries, people either killed or injured, compared to cars. UK data for casualties, i.e. the total of all injuries and fatalities combined, showed 6,043 casualties per billion miles traveled on motorcycles in 2017, 25.4 times the rate of 238 per billion miles travelled for