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The first evidence of road development in the Indian subcontinent can be traced back to approximately around 2800 BC in the ancient cities of Harrapa and Mohenjodaro of the Indus Valley Civilization. Ruling emperors and monarchs of ancient and medieval India continued to construct roads to connect the cities. The existing Grand Trunk Road was re-built by the Mauryan Empire, and further rebuilt by subsequent entities such as the Sur Empire, the Mughal Empire and the British Empire.