As of 2019, the city corporation maintains about 471 bus route roads and 33,0000 interior roads.[372] The Chennai–Mumbai and Chennai–Kolkata prongs of the Golden Quadrilateral system of National Highways start from the city.[373] In addition, four major National Highways (NH), namely, NH 4 to Mumbai (via Bangalore and Pune), NH 5 to Kolkata (linked via NH 6) (via Visakhapatnam and Bhubaneswar), NH 45 to Theni (via Villupuram, Tiruchirapalli and Dindigul) and NH 205 to Madanapalle (via Tirupati) originate in the city, connecting it to other Indian cities.