I was in moderate traffic (car in front of me was several car lengths ahead of me, not locked on in blue) with TACC and AP engaged when my car started braking and flashed the red collision car graphic. I was very confused because the car in front of me wasn't braking and was quite far away, then I noticed a disgarded bag of chips (the kind with the metallic looking liner) floating across the lane in front of my car. As soon as my car cleared the bag everything went back to normal. I have yet to receive the 8.0 upgrade so I'm still on 7.1, I'm wondering if the reprogrammed radar would behave in the same way with 8.0.