I cycled past someone today, who was wearing all black, grasping what appeared to be a 2 litre bottle of cola between their hand and the handlebars and then with the other holding a phone.
The person had no rear or front lights, no reflectors, nothing... it was only because of the car behind, illuminating the road into the distance that allowed me to see them in advance, and my front light isn't exactly dim!
If it wasn't for me being there with my rear lights and reflectors, dare I say the car behind might very well of continued at 35 Mph into the back of them without seeing them?
To make matters worse, the roads around here have no street lights and shaded by trees meaning it is truly pitch black.