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Linearity, Capacity and Surface of Roads
On a soft surface the road conditions deteriorate with the growth of traffic. The need for linear roads increases as well as the construction of hard (paved) surfaces. People are minimalists, so trails always followed the easiest or shortest path, which is still the case today. Well-trodden paths tend to be preferred since they imply less effort (energy consumption). On plains, the straight line was the shortest path chosen, while the contour line was privileged in mountainous areas since it minimized efforts. In steep gradients, zigzagging appears to be the norm.