Classic one this evening. Unlit NSL road, with puddles and debris. What looked like a BMX bike, with the only light being a white one attached to a back pack, so as well as being the wrong colour, it was bouncing around all over the place, most confusing. As well as the lack of lights, there were no pedal reflectors, no other reflectors and, of course, the rider was in dark clothing.
That road is not particularly fun to ride on with decent kit. It's my commute (although I'm going the other way when it's dark) and back in the day when my lighting was not so reliable1, I've had some very uncomfortable moments in the gloom.
1: I've never had a complete failure, but a fading Ni-Cad was close enough.