3. The relative contributions of roads and railways to national development in U.S.A
(i) Increased agricultural,mineral and industrial production
(ii) It aids the movement of people from one place to another
(iii) It links areas of production with areas of consumption
(iv) It leads to increased trade between towns
(v) It generates revenue
(vi) It leads to diffusion of ideas and innovations
(vii) It promotes employment opportunities.