How build grand trunk road?

The Grand Trunk Road, one of Asia's oldest and longest major roads, was originally built by the Mauryan Empire in the 3rd century BCE and later expanded by various rulers, including the Mughal Emperor Sher Shah Suri in the 16th century. The road was constructed by clearing pathways, laying stones, and creating bridges over rivers, facilitating trade and military movement between regions. Over the centuries, it has evolved, incorporating modern engineering techniques while retaining its historical significance as a vital trade route connecting India, Pakistan, and Bangladesh. Today, it remains a key artery for transportation and commerce in the region.