[844PHW]

It has occurred to me that in the above account of my experience, the key factor is that the car was over the centre line of the road because there were parked cars occupying the left edge of the road. Most of the time it is ok, but sudden changes seem to briefly trigger the alarm. (And yes it is a more hazardous situation than most).

Does all this gadgetry reduce the likelihood of an accident? Probably.