Yes - fair enough. But if she had performed an emergency stop because someone stepped out, I would have seen a) the person, and b) her brake lights. Given that we were going at the same speed, then I would almost certainly have had time to stop. But because she effectively stopped as if she...
Rather bizarrely, I've had the opposite experience. I went into the back of a car on a roundabout, as the driver in front changed from second to first, instead of up to third, and stalled the car dead; as the chap behind me said - it was like an emergency stop, but with no brake lights. Our...