I watched a program on this on Discovery Channel. Traffic conjestion has all but ruined the Autobahn. Very few places you can get much above 55 let alone 100. True, there's no speed limit, but it was built back in Hitler's day and is mostly two lanes in each direction. With all the on/off ramps, it's simply not possible to drive or ride WFO
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Depends on where you go. A3 between Frankfurt and Wuerzburg is always bad due to the never ending construction and the insane amount of traffic every morning. A6 between Ansbach and Nürnberg is always bad on Fridays, usually a 10 mile long stretch of solid traffic. A9 from Nürnberg to Munich has a few good long stretches that have 3 lanes each direction where you can spend a little time in the left lane WOT before you have a VW, BMW, or Audi station wagon that appears out of no where, passes you, and disappears off in the distance. After 3 years here, it still surprises me when I'm cruising at 80-85 and I have someone pass me like I'm standing still.
The are 4 reasons I love driving/riding on the autobahns here.
1. You are required to yield to faster traffic behind you
2. you can only be in the left lane if you are passing
3. by law, trucks are not allowed on the autobahn on Sundays
4. it's illegal to pass on the right.
Usually the left lane is open to pass and people actually use their blinkers to pass. Once I set my cruise at 80, I can usually leave it there while riding in the right lane and pulling into the left lane to pass. Took a 200 mile autobahn ride today and only once did I hit traffic that brought me to a stop for 30 sec or so and did the stop and go thing for 5 min. Other than that, I spend most of the day riding 70-80 mph.