The major problem with these modern systems is that they are made to pass specific tests in a controlled environment. On the road there are too many variables which will the algorithms cannot cope with , and so will fire off a signal to the braking control unit once parameters have been passed even though we think it everything is fine and dandy. This makes us mistrust the car and question whether its fit for purpose? So we either live with it or as we presently can, turn it off . As more of these cars come onto the roads , we are going to see more of these incidents take place, some right in front of us, so we are going to leave an extra few metres gap to the car in front. ( just in case ). Maybe that's what the powers that be wanted in the first place and this is a roundabout way of achieving it.