I have some hints.
Sun. Bikers will ride into the sun morning and night. When they are riding into the sun, cars coming from behind them are blinded, sometimes totally. Biker gets hit from behind and everyone blames the driver.
I live in an area served by narrow two lane roads with lots of hills and curves. Of the roads I use every day, one runs east and west and the other north and south....exactly by the compass. Both are favorite bike routes.
Weather permitting, there will be an idiot on one of them riding into the sun early in the morning or late just before sundown.
And even worse, every now and then one will ride through dressed as though he is going to sniper school....gray seat shirt or sweater, even an olive green occasionally.
There should be a law that ALL bikers must wear dayglow orange or the luminescent green and have a real strobe light front and back.
Bikers should always be aware that on narrow roads with overhanging trees, the driver may be in the bright sun and his eyes are adjusted for the glare and the biker ahead of him is in the shadows where he blends with the shadows and the trees. Sure death if the driver is not expecting it.
You are correct about the sun blindness. It can be very dangerous. Early morning and late afternoon can be very dangerous, while driving or biking into the sun.