Answer:
Metalled
roads are all weather roads, whereas unmetalled roads are difficult to use in
the rainy season, as their top surface becomes uneven due to absorption of rain
water. The reason is that metalled roads have a waterproof coating on the top
surface, making them usable in all seasons.
Many border roads are of strategic importance in the border areas. They
have improved accessibility in areas of difficult terrain and helped in the economic
development of the border areas of the country.
National highways link important parts of the country like
state capitals and commercial centres.
They enable fast and efficient movement of goods in areas
connected to them.
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