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so that you have both a positive camber to assit turning and also to aid water drainage A road is "banked" (that's the term for the side-to-side sloping that you are talking about) so that, from the perspective of a car traveling along the road, the angle of the curve is lessened, making it easier for a driver to negotiate the curve. To understand this better, take the following extreme example of banking. Imagine that a road is banked a full 90 degrees, or completely vertical, in a curve. Then imagine that you are driving along this road. Of course, if the road is banked 90 degrees, or anywhere close to it, your car will fall off, so we are suspending the law of gravity for this example. As you enter this curve, and the road banks a full 90 degrees, you will find that, from your perspective as the driver of the car, the road does not curve at all, though it does climb a steep hill. At a full 90 degrees, you do not have to turn your steering wheel at all to keep your car on the road. Again, that is an extreme example. Roads are not banked anywhere near that much in real life. In fact, except on NASCAR tracks, I doubt any roads are banked more than 10-12 degrees. But you can imagine that, if a full 90 degree banking results in no curve at all (from the perspective of the car), then any banking at all will result in a lessening of the angle of the curve, from the perspective of the car.
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