Women usually have better peripheral vision than men. Also we hear and smell many more things, than we consciously notice.
That plus subconscious monitoring of nearby males and how they move, if you're a woman roughly speaking if one is in your blind spot it's sufficiently probable he would be using that chance to look at you (or parts of you).
> I never did figure out how they knew.
Did you tried to figure out do they know that you are not looking at them? Would they look at you if you are not looking?
This article describes one situation of sensing when someone stares at you:
https://bigthink.com/surprising-science/why-is-it-you-can-se...
However, in the situation I describe, they are looking at the road ahead and not noticing me or where I might be looking. They seemed to be able to sense that I was looking at them before they even noticed that I was there.
There is something called peripheral vision
https://en.m.wikipedia.org/wiki/Peripheral_vision
If there is a movement in the corner of the eyes, like someone turning their head towards you, you can spot it subconsciously, or if you trained it a bit, consciously.
How did you know they were not looking at you if you were not looking at them? I suspect the answer to the mystery lies here.
Ok. Solved. They used their peripheral vision. When you looked at them they saw it, and would look at you
That being said I don't think some sort of telepathic phenomenon happening here would be the strangest thing in this universe
It's funny... On one hand, I don't believe in psychc phenomenon. But on the other, I have certainly seen and experienced some things in my life that are very difficult to explain.
I've become a lot more aware over time though of the very subtle ways in which information can leak about things. People are often awash in information which they are totally oblivious to.