Barrackpore Trunk Road, commonly known as BT Road, is a four- and six-lane trunk road in Kolkata metropolitan area, West Bengal, India. It connects Kolkata with its suburb Barrackpore. Built in 1775, it is the oldest metalled road and one of the busiest roads in the country. The 18.1 km (11.2 mi) long road is a part of both State Highway 1 and State Highway 2.