(i) Golden Quadrilateral Super Highways: These projects are implemented by the National Highway Authority of India (NHAI). There are three major Super Highways.
Golden Quadrilateral starts from Delhi, moves to Mumbai, Chennai, Kolkata and back to Delhi.
The North-South Corridor starts from Srinagar to Kanyakumari. The East-West Corridor connects Silchar to Porbandar.
These roads are laid and maintained by Central Public Works Department (CPWD). A number of major National Highways run in North-South and East-West directions, e.g., Sher Shah Suri Marg is called National Highway No.
Roads linking a state capital with different district headquarters are known as state highways. These roads are constructed and maintained by States and Union Territories.
These roads connect the district headquarters with other places of the district. These roads are maintained by the Zila Parishad.
These roads link rural areas and villages with towns. These roads are constructed under the Pradhan Mantri Grameen Sadak Yojana.