We have the big and beautiful 280 between Mountain View and San Francisco, and I thank goodness every time I make my way to the city for it. I'd never go the speeds on my bike I do on 280 anywhere else, but it's just such a gosh darn huge road I get to make a 45-60 minute trip in like 30 minutes.
It very much depends on where in the U. S. one is at. East of the Mississippi River (eastern U. S.): I'm a good boy who doesn't do more than 10mph over the limit. The exception is Ohio: if I can't avoid the state completely, I do THE SPEED LIMIT.
Western U. S.: whatever I think I can get away with. IOW, if I can see for multiple miles with few cross roads and driveways, then it's whatever I feel comfortable with. Though with western speed limits of 70mph and up, one can comfortably get away with 85mph, which is fast enough for me. Much beyond that, on the bike or in the car, and it gets tiring and the difference in fuel efficiency is huge (28mpg or less at "spirited" speeds on a bike that normally gets 42-45mpg). And the last thing one needs in a vehicle with a 5 gallon tank, and an area with few gas stations, is poor fuel efficiency. With increased fuel stops, I'm not convinced that one saves a minute of time after a point.
In this instance, think of the U. S. more like the EU. We have Montana and Nevada, they have Germany. We have Ohio, they have (for lack of a better example) the U. K. with speed cameras everywhere (yeah, yeah, Brexit; bear with me for this example).
Lol, I bought my RX-7 from an Ohio state trooper, in Ohio, and we raced the entire 2.5hr trip out of the state, in the rain. I think he called his buddies to leave us alone.
The European country you're looking for for your Ohio-equivalent example is Switzerland (sorry dudes but I've never seen police so strict to the point of silliness anywhere else in Europe).
That's actually a big question I have as a new Californian. In Houston, you got caught, every time, if you sped on the freeways. The cops were everywhere.
Here not only do I rarely see cops, I've read in the local papers that cops can't pull people over for speeding if EVERYONE is speeding. You have to be speeding far above average. So everyone is actually incentivized to speed together.
When I first got here I saw comically low speed limit signs - as low as 55mph on freeways! And averages of 65! That's INSANELY slow for how big these freeways are! But apparently it doesn't matter in California, here everyone just speeds and is protected as a group.
I don't doubt that I'll pay my dues eventually. You don't get away with 95mph on a sportbike forever. We make targets of ourselves. That's fine, in Houston I got ticketed ~200USD every three years or so, that's a fair price to get to go above the speed limit for me.
I usually go at 75-80 on a "55" highway for my daily commute, never had issues even while passing cop cars. In general, as long as you're not driving like an idiot (switching 3 lanes without signalling) or running old tags, or basically have a red flag hanging, they won't bother you. Although if they do stop your for one of these reasons, they'll probably also ticket you for speeding. Speed limits are enforced far more strictly in residential areas though.
