My two big fears are being taken out by a car pulling out of a driveway or righthand side street and a head-on with a left turning car. Hitting the car pulling out of the side street would be messy. Colliding with the left turning car - very likely fatal.
So, in recent years I added rear flashers (Planet Bike) to the waist strap of my reflective vest so they sit on the forward corner of my hip. Cars apparently see them as I now observe cars clearly waiting for me. This even happens on the days when I forget to put the headlight on my bike. (First time I forgot the headlight, I was slowing and yielding for left turning cars until I realized we were pulling the old Pennsylvania driving law of each motorist waiting until the other had passed. Obviously they saw me!)
I have also been told those lights on my hips are very visible from behind although that was never my intent. The part I like is that they are completely out of my vision, even when I am riding stealth without a headlight. (I never plan to ride "stealth". I do however sometimes forget to move the headlight from the charger or other bike when I am leaving in daylight hours. The vest lives with my riding clothes indoors and gets included as I pack my bag. I did ride without a headlight intentionally for decades after I hit an opening car door and realized motorists absolutely were not aware of the feeble pre-halogen headlights. I used a rear light and the French leg light; again a light I don't see while I am riding but is very noticeable to others.)
Ben