There are classes of motorcycle accidents that are not a function of rider speeding or otherwise being careless. The one that took the life of a coworker is described as follows: the motorcycle is travelling on a country two-lane road, trees alongside, sunny day, and a vehicle comes from the other direction and turns left across the path of the motorcycle. At closing speed over 160 kph (80- 100 kph in opposite directions) the gap is closing at over 45 m/s and dappled lighting makes it hard to see the motorcycle even with a daytime headlight. Years after my friend's death I read a chapter in a book on forensic engineering which covered the situation in detail (not my coworker's death specifically, but this class of motorcycle accident as a recognized pattern).