In my experience, I only had my car activate this once in 8 years. I was on the M6, and it was slowing down, I changed lane and start slowing, and somehow just

In my experience, I only had my car activate this once in 8 years. I was on the M6, and it was slowing down, I changed lane and start slowing, and somehow just miscalculated, and was still going 10 mph when the other car was stopped. I was just too relaxed, and it kicked in and braked for me. Saved me a rear end, and became worth the money.