This mega project is 14.500 kilometres long and passes through Patna, Saran and Vaishali districts of Bihar. New Delhi: The Cabinet Committee on Economic Affairs chaired by Prime Minister Narendra Modi here on Monday has approved the construction of a new four-lane bridge with a cost of Rs 2,926.42 crore, parallel to the existing MG Setu, across the Ganga River on NH-19 at Patna. Length Edit The highway has a length of 1,435 km (892 mi) and runs through the states of Delhi , Uttar Pradesh , Bihar , Jharkhand , and West Bengal . It constitutes a major portion of the historical Grand Trunk Road along with NH 1 and NH 91 in India. The lengths of the highway in each state are: Delhi : 12 km (7.5 mi) Haryana : 74 km (46 mi) Uttar Pradesh : 752 km (467 mi) Bihar : 202 km (126 mi) Jharkhand : 190 km (120 mi) West Bengal : 235 km (146...