We have a road in my town with a couple of curves that have a negative camber. I usually don't go on that road, because I always thought it had too low of a speed limit. Maybe it doesn't.
It's typically a drainage issue that causes them to be built... But generally, depending on the speed limit, the road is required to have a superelevation... Meaning the normal crown of the road gets rotated to a positive slope on the outside of the curve.
It's either a very old road, or has tricky drainage issues. ASHTO regulations determine the speed limit. Follow the posted speed limit, and you should be fine (in most circumstances).
When I was just lad out on my '75 suzuki gt 550 I discovered how quickly a negative/ off camber turn can make you look like a rookie. This turn was an off ramp from I-90 to rt.85 near where I grew up...and to make it worse it was a decreasing radius too. Lessons learned that day, learn to counter steer and trust your tires.
Decreasing radius? Man, where do you guys find these roads? It's called a spiral, and almost never used. Drivers don't typically like having to continually turn their steering wheel around a curve... That's why you can usually hold the wheel once into a turn.
Railroads use spirals... Very rarely on roadways.
Compound curve, occasionally... But that's different also.