I don't like riding with the low winter sun behind me.
Sure, I can see stuff in front of me, but I'm aware that drivers coming towards me can't see me.
Also, there's the weird thing with the long shadows...
A big vehicle like a bus or HGV will cast a long shadow that sweeps over me like I'm about to be run over, even when the vehicle is actually a safe distance behind.
It's really quite disconcerting.
This happened every winter commute home when I worked in Banchory, I was riding directly Eastwards.
Aye, you can see in that picture that while I can't easily see the oncoming rider, the car behind the rider clearly has.
The risk there is if I had a car behind me wanting to overtake and the driver thought it as clear.
I only knew they were there to take the photo because I saw the pedal motion at the rise from the bottom of the stroke.
I've come across very similar in the height of summer, riding North West along a country road in the earlyish evening (by late june standards) with hedges, MTBer riding in the gutter almost completely hidden by the contrast and dark clothing.
Again it was the pedal motion I spotted, at least I was on the bike.
I want to try and get similar conditions with both to see if a standard set of dynamo LED lights actually help or not.