Do they crown the roads? When I drove through rural NV the roads were spirit-level flat. Easier to build that way, I'm sure, but they don't shed water.
When I was a kid in the 80s, interstates had a black stripe down the middle of each lane. From oil when all cars were RWD and had rope rear main seals. Now there's not so much of that here, but you might have it there, since cars don't die of rust.
So you've got oil slicks, bald tires, no road crown, and people who don't slow down. Yippie!