I live on a two lane road that is so narrow the bus wheels are on the edge line and the double yellow line at the same time. There are multiple curves so sharp that the tail of the coach tracks about 2 feet onto the other lane, or I have to poke the nose about 2 feet into the other lane just to keep the drive tires on the road because of the curves.
There are no shoulders and in most spots if I drop off the edge I am likely to roll the coach.
So cars that are coming at me are a real threat. And a lot of them never slow down. Ironically the school bus drivers are more than willing to come at me without slowing and I know for sure our mirrors will not pass unless we each jog to the right slightly so I intentionally stay into the oncoming lane until the school bus, or dump truck slows sufficiently so we can pass safely. Even a big Prevost is not intimidating enough to drivers that should know better.
Everyone is in a big hurry, or doesn't want to be behind someone, or is busy texting and not driving. So I am an interstate driver and I will only rarely drive on smaller roads because even if I could go fast, it still wouldn't be fast enough for some of the morons.