Its virtually every morning going to work on the cycle track that I meet someone coming the opposite way with no lights and dressed in black. Usually its the postman, if I'm lucky I see him silhouetted by cars from behind him. Twice I have nearly had a head on with him but because he can see me with all my lights he takes evasive action at the last moment and swerves onto the road. Yesterday morning he apperead out of nowhere again, I thought he had a light as I could see a faint orange glow very close up and as we passed saw that he had a faint light.......covered up by his mailbag!!! and as for his rear light it could not be seen from less than 20 yards away it was that dim.
Then there's this other lad completely in black, on rare occasions sometimes he has a light and if I do not see him approaching by being silhouetted I get the shock of my life as we get close up.......he always has his light pointing vertically downwards at the ground directly in front of and on his wheel so from the front you see nothing, till you are on top of him.
I just cannot understand peoples mentality at times. I believe its a case of "I don't need lights because you have lights and I can see you"