German roads have a pecking order, where the fastest are allowed to cruise at relatively high speed when safe and prudent to do so. Because of this, German cars are often developed to allow continous high speed cruising. Gas mileage goes way down, tire wear goes way up, accidents are much more dramatic, but it was built into their culture. Times are quickly changing there. Strong push back against the arrogant rich who can afford high powered Mercedes, BMW and Audi capable of dominating these lanes. Speed limits are going into most of these roads, speed cameras make it expensive, poorer road maintenance and significant traffic increases make areas of un-limited speeds less every year. Strong ego's fueled by high salaries making some feel entitled to do this are having their wings clipped. I got a big fine for speeding on an unlimited stretch of the AutoStrata. Went quickly through a short tunnel, and found the Politze waiting at the exit to flag me down. They took my credit card on the spot and sent me on my way. My Alfa felt strong and stable at those high speeds.