I've driven on the German Autobahn. Our highways are absolutely deplorable compared to the Autobahn.
I didn't worry a bit about the condition of the road when the Mazda 6 Turbo Diesel I had rented in Germany was pushing @ 190kmh as I drove to the Netherlands. No potholes, no unexpected bumps or buckling in the road, none of that on the Autobahn.
In fact, the road was so good I pushed that Mazda Six Turbo Diesel all the way up to 220kmn on the way back. Amazing vehicle. A diesel that accelerated, sounded like, and ran like a gas powered engine, able to hit 220kmh (@140mph) and do that all day long.
I wouldn't dare try doing that on the American highway system with how crappy our roads are constructed and maintained.
There are some roads when you get out west.
Don’t tell anyone, but my rig didn’t have a governor on it, and going through AZ, NV, Some places in MT, I had her up to 120-130 just to see what she would do.
No real weight, 10-12000 lbs of FedEx crap.