<P> The route spanning the Grand Trunk (GT) road existed during the reign of Chandragupta Maurya, 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 . </P> <P> It coincides with current N1 (Chittagong to Dhaka), N4 & N405 (Dhaka to Sirajganj), N507 (Sirajganj to Natore) and N6 (Natore to Rajshai towards Purnea in India) in Bangladesh; NH 12 (Rajshahi to Purnea), NH 27 (Purnea to Patna), NH 19 (Patna to Agra), NH 44 (Agra to Jalandhar via New Delhi, Sonipat, Ambala and Ludhiana) and NH 3 (Jalandhar to Attari, Amritsar towards Lahore in Pakistan) in India; N - 5 (Lahore, Gujranwala, Gujrat, Jhelum, Rawalpindi, Peshawar and Khyber Pass towards Jalalabad in Afghanistan) in Pakistan and AH1 (Torkham - Jalalabad to Kabul) in Afghanistan . </P> <P> Research indicates that the Grand Trunk road predated even Buddha's birth and was called Uttara Path, meaning, road to the North . Salman Rashid attributes the Road's construction to Chandragupta Maurya . During the time of the Maurya Empire in the 3rd century BCE, overland trade between India and several parts of Western Asia and the Hellenistic world went through the cities of the north - west, primarily Takshashila (in present - day in Pakistan). Takshashila was well connected by roads with other parts of the Maurya empire . The Mauryas had maintained this very ancient highway from Takshashila to Pataliputra (present - day Patna in India). Chandragupta Maurya had a whole army of officials overseeing the maintenance of this road as told by the Greek diplomat Megasthenes who spent fifteen years at the Mauryan court . Constructed in eight stages, this road is said to have connected the cities of Purushapura, Takshashila, Hastinapura, Kanyakubja, Prayag, Pataliputra and Tamralipta, a distance of around 2600 kilometers . </P> <P> Sher Shah however remains the only mentioned person as the builder of what is now the complete stretch of GT Road, which was referred to as Shah Rah e Azam (Urdu: شاہراہ اعظم ‬ ‎ or The Great Road). During his reign, Caravanserais were built and trees were planted along the entire stretch on both sides of the road to provide shade to travelers . Wells were also dug, especially along the Taxila section . The Mughuls later extended the road further east to Chittagong and west to Kabul and referred to the road as Sarak e Azam (Urdu: سڑک اعظم ‬ ‎, also meaning The Great Road). </P>

Who build grand trunk road from sonargaon to indus
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