I think I've seen a video of it operation, if its the feature I think it is, and it uses the proximity sensors to stop you driving into things, it otherwise remembers the driving inputs and does them in reverse. BMWs and other cars actually put the brakes on to stop you having a low speed bump, it's a bit wierd but you can literally drive slowly towards a wall and the car will stop you when you're very close.Sounds logical, but what happens when something changes, like the parked car next to you leaves and another fills that space, but parks very close to you?