A combination of downhill slopes and corners is the most dangerous for riders, according to one of the most comprehensive motorcycle crash studies in the past 35 years.
The study by the Virginia Tech Transportation Institute for the American Motorcycle Safety Foundation used 100 riders with five video cameras on their bikes for several months and over half a million kilometres.
It produced a lot of data which is still being processed and analysed.
The Virginia Tech study is the first major crash survey since the comprehensive and often-quoted Hurt Report of 1981.
Obviously motorcycles have changed a lot since then. They are lighter and more powerful, have better tyres and handling and many have rider tech aids such as ABS, traction control, etc.