How do they decide the way mountain roads twist and turn?
In: 200
Roads on plains are about getting from Point A to Point B without much change in elevation. Mountain roads are much more about elevation, about ascending or descending the mountain from Point A to Point B. The road between them is a combination of following the shape of the land (into gullies and out over ridges) while steadily going up or down that change in elevation. The steepness (grade) of the road is kept below that which makes it difficult for cars to drive. If there is not enough distance between Point A and Point B to do that, the road doubles back on itself (switchbacks) to increase the distance the amount of elevation is spread out over.
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