Sharing the road with a sane driver travelling at sane speed limits in a sane car is perfectly reasonable. There's no practical reason 95% of motor vehicles couldn't be as small as the eu L7e class (or even half the weight) and governed to 40km/h (with a manual override for larger roads) with the remaining 5% only travelling on local roads by timed permit. Filling the roads with monster trucks is an intentional policy choice, not some inevitability and even not what people would naturally decide to do.
For rural roads a bike lane works fine as there are very few conflict points.
> “Filling the roads with monster trucks is an intentional policy choice”
It really is. For decades, US fuel economy standards, emissions rules, and tax breaks and depreciation rules have all been weighted in favor of bigger, heavier vehicles.
For rural roads a bike lane works fine as there are very few conflict points.