I hate, hate, hate overtaking on the right but it's the only way where I live. And it's a funny paradox.
On the highway I generally want to do about 10 over the limit and maintain about 7 or more car lengths in front and behind other cars. I generally sit in the #3 lane from the left leaving the #4 lane for cars merging on-off and #2+1 for overtaking.
On a constant basis cars will slowly creep up behind me 'til I'm in their field of view, ie 2 car lengths or less. So I move over to allow them to overtake, as they'll never, ever simply pass me on my left.
Generally they just want to camp out about 1.8 seconds behind me while they talk on the phone.
So I brake to force them by, and drop in behind them . Often they slow significantly as they weren't actively choosing a speed, but marking my speed at by keeping me at the extent of their field of view, also known as "less than 2 seconds at 70 mph" or "30 feet".
I've had trips back home from the track where other cars are running closer to my truck and trailer than I saw in the open wheel/sports racer group all weekend.
The problem has a few moving parts:
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People don't keep their eyes up. They're looking a couple car lengths up, not at the extent of what they can see. This results in "surprises" for them that I've seen hundreds of feet sooner.
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People follow too closely. Combine this with the bad visual habits, and it's where those accidents we can't fathom ("How do you ball up a car going in a perfectly straight line at sub-cool down lap speed, honestly?") happen.
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People don't know how to overtake, and have no place to do it if they did.
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Turn signal usage is so infrequent that it's honestly surprising when they're used.
I've driven about 5000km in The Netherlands, Italy and Spain in the past 5 years or so. None of these problems exist there.
After a week in Spain and close to 2000km, I came up on a car in the left lane, and they didn't instantly signal and make a swift, sure lane change left. Within 1 minute there was a line of cars behind me. I moved right to let the next guy back try to be noticed, but left room for him to pass on the right if he chose to. He wouldn't, nor would the next couple cars. Finally the truck got about 2 meters behind the car and made a gentle suggestion w/ the air horns. They moved right, and sheepishly waved apologetically to each car as we drove by.
I think the US, at least around the major urban centers on the east coast is irrevocably broken.