My older brother was in Germany in 1962.He said if you get on the Autobahn and if you are in the left lane and somebody behind you flashes their lights, you Better get in the right lane!
When they do have auto accidents on the Autobahn, they are real beauts.If a Mercedes Benz or a Volvo vehicle is involved, Mercedes Benz or Volvo sends technicians to the accident scene to find out exactly what happened, or so I once saw on a tv program not many years ago. cuhulin