Many years ago I was headed back to my shop. On the last road within .5 mile of the shop I noticed a truck following me very close, too close to see the windshield in the rear view mirror of my NX2000. I tapped the brakes as a warning, then when I slowed down to turn left into the parking lot she hit me. My employee went to the hospital. I went back to work. She called her husband who showed up in a couple of minutes. They were rich old time residents (many generations) and they immediately went on the offensive. She claimed I did not put on my trun signal.
I told her and the cop, "I didn't realize the penalty for failure to signal a turn was to get hit by an idiot in a GMC truck!". Beside that she couldn't SEE the signal since she was so close to my rear end, all I could see. in my rear view mirror, was her grille!.
Guess who got the ticket and paid for the damage
(her).
I always thought some form of energy absorbing beltline device would dramatically reduce collision damage. Back when the 5 MPH bumpers first came out you could actually bump into another car at low speeds and not do $3k in collision damage.
regards
Mech