The Grand Trunk Road is one of Asia’s oldest and longest major roads. For more than two millennia, it has linked the eastern and western regions of the Indian subcontinent, connecting South Asia with Central Asia. It runs from Chittagong, Bangladesh west to Howrah, West Bengal in India, running across Northern India into Lahore in Pakistan, further up to Kabul in Afghanistan. Its former names include UttaraPatha (“Road to North”), Shah Rah-e-Azam (“Great Road”) or Sarak-e-Azam or Badshahi Sarak.

The route spanning the Grand Trunk (GT) road existed during the Maurya Empire, extending from the mouth of the Ganges to the north-western frontier of the Empire.The predecessor of the modern road was rebuilt by Sher Shah Suri, who renovated and extended the ancient Mauryan route in the 16th century.The road was considerably upgraded in the British period between 1833 and 1860.

Source:Wikipedia