Just to thread hog, which may be interesting - me/Potsy's 'unknown at the time encounter' - we do spot each other on the road.
We both use an off road path, and road route, and we 'bump into each other occasionally'.
Anyway I've been using an off road route, by the river, to get to and from work. It's the Trans Pennine, and can be a bit muddy, so on goes full guards (this year's addition) - the mud is like concrete though.
I see the odd cyclist and maybe one or two pedestrians. Say a cheery hello to dog walkers in the mornings, nevr any issues and all is good.
But at night:-
You go from trying to spot a pedestrian in pitch black, to a bike with a 'candle' on it, to what me and Potsy are running
- you can ride as fast as you can and see anything, so slow down, re-aim lights and pass - the ped's really appreciate it as you don't suddenly sprout upon them.
There are the odd folk that cycle in pitch dark with flashing bright lights, even two T6's on constant can't compensate.
I'm sure me and Potsy saw each other a fair distance out, as there was just 'light' coming out from the bikes (normally it' a little white glint), so we both aimed down as we'd seen each other, but the idiots that ride down there with no lights - sorry I've obliterated YOUR night vision, but get a light !
Peds appreciate the light from behind, I can pick them up early, but head on I can drop the lights to the floor straight away as soon as I spot the dark shadow.