How do they decide the way mountain roads twist and turn?
In: 200
They plot a path that gets the road through the hills as safely and effectively as possible. They don’t want steep rises and drops, they don’t want too tight turns. So often they go along a valley floor, or along the lower slopes of hills, and try to find a path that minimizes sudden changes in directions. If they have to, they use tunnels or bridges to even things out. If necessary they cut through the tops of ridges. They work with topographical maps or 3D models and lay it all out ahead of time.
Often much older roads originally followed trails worked out over centuries by people on foot or horseback.
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