I should read the posts first to last instead of last to first so I can get all my comments together.
But back to the safety features of modern cars: I picked up the E63s wagon in Bethesda, MD, a place I'd never been. They set up the car for my phone and turned on every feature, all the uplink/downlink stuff you have to rent from Mercedes. I ended up leaving right at rush hour, with no idea how to get to Rt. 95. The car was guiding me though, that was a first for me. Just minutes from the dealer I was looking over my left shoulder in high stress mode (new very powerful, unfamiliar car with carbon brakes, in heavy traffic in unfamiliar city) to clear a right turn so did not see a jaywalking pedestrian crossing diagonally, lackadaisically, and the car in front of mine that was through the turn and out of my attention had stopped. The dealership had engaged every driver assist, and while I was still looking for oncoming traffic my car suddenly stopped just a meter from the car in front of me. Sold. This is the way.