Last night, I had a dream that I was riding in a car that was driving down a highway somewhere. At one point, we were going down a really steep incline—I mean, really steep. It looked like we were going straight down the side of a cliff. This is the first time I’ve had one of these dreams in a long time. I used to have them a lot as a kid, but it’s been about twenty years since I had one, I’d say.
Anyway, I was wondering: Where is the steepest incline on a paved road and how steep is it? I mean, I know there are mountain paths that are probably very steep, but I’m talking about U.S. highways and whatnot.
Also, how steep an incline could your average automobile drive down safely and with little or no problem?