I was hit head on by a drunk no-light wrong-way cyclist, some high school kid. I was moving at my usual speeds, pretty blinking fast at that time. Probably faster than "safe" - but not that fast. Maybe upper 20s. The idiot's wheel hit mine and slammed into the axle. Fork folded, frame buckled completely, one side of the handlebars bent down. I was double strapped into clips with cleats. Landed on my head in the pre-helmet era. Lost lots of blood and had a tremendous concussion. Only a minor fracture.
These folks can indeed be a tremendous danger, light or dark outside. I just don't get the into-traffic lunacy.