Due to topography, Autobahn roads can still be very curvy. The Albaufstieg [0] is an extreme example but not the only one. Notice the sign at 3:04, it's limited to 60 kmh. Weather can make those curves even more dangerous, e.g. rain or ice. As for objects, they still occur. One example is prior accidents. Another example is the end of a traffic jam. These are an especially bad problem for trucks [1], that actually drive way slower than 130 kmh even. The problem here is driver attention, but too fast speed can also contribute [2].
I know that A8 part. It’s pretty cool. The speed limit there is most likely due to how steep it is. Trucks are pretty slow there. The ICE goes around that mountain as slow as the traffic on the Autobahn.
