Almost rear ended someone last week. Going down slight grade, lightly on brakes and hit bump in road and car surges (lurches) ahead as I slam on the brakes and swerve into the curb to avoid hitting them. I know about the brake transition and has happened quite a few times for me but this was the worse. I have it pretty much narrowed down to between 25 to 20 mph and very lightly on brakes slowing down. The surge (lurch) is what I am told due to the brakes switching over to manual mode, and in that split second car free wheels and scares the bejesus outta me every time. Just curious if this happens to others as well. 2011 Prius III 33,000 miles.