In fact, there are advisory speed signs for those curves that are accurate -- if people followed them, there would rarely be an issue. Part of the problem, I think, is that if you're driving a car, those advisory speeds are far too slow (15-20 MPH on a 50 MPH road), but if you're driving an RV or big rig, those advisory speeds are critical. I think most non-pro drivers are used to driving cars and have trained themselves to ignore those signs.
I honestly think that people should have special training to be allowed to drive RVs, or at least the larger RVs. Something like a motorcycle tag.
> Common highway lanes are 10 feet wide.
These roads are also narrower than modern ones (they are some of the earliest "highways" built in the state). When I drove an RV on them, I tended to white-knuckle it. They're rather nervous-making.
Most drivers think they're above average at minimum in their driving skill; most could use to take both a basic math course and a driver's safety class.
Many states have such rules, e.g. California & Texas.
Many RVs are 8.5 feet wide. Common highway lanes are 10 feet wide. There are curvy highways like route 1 that I swear are only 9' wide. I worry more about line selection and holding my rig inside the yellows than I worry about line selection when I'm racing my motorcycle. It's challenging for me and I drive things as a sport. I'm not covering for someone who went over the yellows, that's unforgivable, but I wanted to add some context for you.