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The first mode of transport was by foot.
These human pathways would have been developed for specific purposes leading to
camp sites, food, streams for drinking water etc.
The next major mode of transport was the use of animals for transporting both
men and materials.
Since these loaded animals required more horizontal and vertical clearances
than the walking man, track ways emerged.
The invention of wheel in Mesopotamian civilization led to the development of
animal drawn vehicles.
Then it became necessary that the road surface should be capable of carrying
greater loads.
Thus roads with harder surfaces emerged.
To provide adequate strength to carry the wheels, the new ways tended to follow
the sunny drier side of a path.
These have led to the development of foot-paths.
After the invention of wheel, animal drawn vehicles were developed and the need
for hard surface road emerged.
Traces of such hard roads were obtained from various ancient civilization dated
as old as 3500 BC.
The earliest authentic record of road was found from Assyrian empire
constructed about 1900 BC.
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