Nitpick - I believe trucks are usually limited to 56mph and buses 62mph because the speed limits for both in most of Western Europe is 90kph and 100kph, respectively.
The speed limit for buses on UK motorways is 70mph, unless they are over 12m long - most aren’t. Even if they were, it’s highly unlikely they would be ticketed for exceeding the speed limit by 2mph.
Yeah, I haven’t driven the Autobahn, but one vacation I did drive the Italian freeway system. I assume the same applies as in Germany - people actually obey the rules about “slow traffic keep right”. It’s two lanes each way, you stay in the right lane unless you have to pass. Once you pass you get back in the right lane. I was passing some putt-putt (antique Fiat) doing about 130km/h to their 95km/h when a Mercedes comes zooming up, had to be doing 160 (100mph) or better. He flashed his headlights to say “I’m here and waiting”, and once we were past the other car and pulled in, he zoomed off again. So 95kph Fiats and 200kph Mercedes coexisted, with everything in between. The Mercedes just had to deal with the regular slow-downs in busy stretches.
I don’t recall the Autostrada speed limit, but for some reason 120kph comes to mind. Regardless, it did not seem to be enforced.
This was the typical pattern - despite our images of excitable Italians, there was no road rage, no excessive tailgating, no irate honking, no hogging the passing lane slow just to be a dick - in short, nobody seemed to think they “owned the road”, a far cry from US or Canadian driving attitudes. Everybody cooperated and nobody was terribly inconvenienced. I’m sure we all have memories of the idiot who sat in the passing lane blocking traffic just doing the speed limit.
(I was once almost clipped on the driver’s fender by a passing police car cutting in front of us on the British Motorway - we eventually figured out it was their way of warning us for sitting in the middle lane of a 3-laner when we weren’t passing anything, like a typical North American… we moved to the outside lane.)
Of course, this tidy system broke down once you were out of the countryside and into heavy city expressway traffic like Milan or Rome, but on the open road, it worked like a charm.
Another thing I noticed was not as many semi-trailers. There were trucks on the road, but nowhere near the long-haul freight traffic we have here - more like the 5-ton box trucks and similar. I attribute that to a better and more dense rail system, and the fact that most cities are too old to be big-truck friendly.