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The second World War saw a rapid growth in road traffic and this led to the deterioration in the condition of roads. To discuss about improving the condition of roads, the government convened a conference of chief engineers of provinces at Nagpur in 1943. The result of the conference is famous as the Nagpur plan.
The roads were divided into four classes:
National highways which would pass through states, and places having national importance for strategic, administrative and other purposes.
State highways which would be the other main roads of a state.
District roads which would take traffic from the main roads to the interior of the district . According to the importance, some are considered as major district roads and the remaining as other district roads.
One of the objective was that the road length should be increased so as to give a road density of 16kms per 100 sq.km