Bluntly - I think ninja kill themselves. Putting on dark clothes and sailing unlit into nighttime traffic is just playing Russian roulette.
Over in Advocacy, there is a thread about a ninja maybe-salmon who was killed on a dark section of road in San Antonio. He was wearing dark clothes, had no lights, was riding in the middle of the traffic lane, even though there were wide shoulders, and (people are saying, not sure about this myself) was riding against traffic. A lady in a sedan came along at 50 mph, the normal speed there, and hit him. Instant death.
i sometimes see half a dozen (or more) ninjas riding about my neighborhood on a single trip and despite this i cannot remember the last time one died. that being said the police should spend more time ticketing ninjas and less time staking out the ladd's addition traffic circle.