Right in front of left, OK but on the highway???

Good morning I asked you a question that has already happened to you and that is the following: I drive on the motorway (A8 from stuttgart to Munich) so I am at the height of the DRACKING STEINER HANG there is an exit without acceleration strip, are allowed as far as I know 100 km/h so now the following situation I drive so around 80 km/h because net went faster on the right lane, because on the left everything is full, since my front man suddenly makes a full braking in the middle of the car. I stop a brake uch, natürlich with squeaking tires, look at him ALL FREE, this Vollidot actually braked to leave a car out of the driveway (which without acceleration strips). Argo RIGHT BEFORE LINKS on the AUTOBAHN. I of course do not honked any reaction the woman in the driveway also net understood what he wanted thus stood still. After endless 5 min he finally drove on. Since I could not overtake to the left I naturally had to wait. should you have experienced this situation before?? And what should please do in such a situation.