I was driving on German autobahn at about 100MPH in center lane, a Mercedes passed me on left at about 110MPH When he got about 4-5 car lenghts ahead, we hit a downpour of rain. I let off the gass immediately and he hit the brakes hard. He was instantly sideways sliding down the autobahn at about 100MPH. He hit the left rail with bak end, slid across and t boned the guy in the right lane and slid back to the center rail. meanwhile I am trying to still slow down and not hit him or the guy in the right lane. He hit the center rail hard and stopped sitting sieways in the left lane. I was able to go straight through the center of both of them. Wish I ahd a video cam running on that day.