[blattimwind]

> Of course that requires keeping an eye on not only the traffic in front, but also the traffic behind, and getting out of the way when required, so you have to change lanes quite frequently.

This hits the nail on the head. I know people who complain intensely about Autobahn driving and when I ride with them all of them have very poor viewing technique ("Blicktechnik") and are the kind of driver that's rather oblivious to anything that happens on the road that isn't squarely in front of them. Of course, with these predispositions, just things like merging or changing lanes become stressful each time. You have to be able to do both on the Autobahn, so Autobahn = very stressful for them.