The development and maintenance works are being implemented on the agency basis. The State Government (State PWDs), Border Roads Organisation (BRO), National Highways Authority of India (NHAI) and National Highway and Infrastructure Development Corporation Limited (NHIDCL) are implementing the development and maintenance works on NHs. At present, projects of widening to 4-lane NH configurations or more and Expressways under Bharatmala Pariyojana Phase-I including erstwhile various phases of the National Highways Development Project (NHDP) subsumed under it and other Schemes are being assigned to NHAI. The projects of development to 2-lane NH configurations with or without paved shoulders under NHDP or other Schemes are primarily being assigned to the State Governments, viz. State PWDs, State Road Construction Departments / Corporations, etc. The Projects under Special Accelerated Road Development Programme for North-Eastern Region (SARDP-NE) including Arunachal Pradesh Package of Roads are now being primarily assigned to NHIDCL; further NHIDCL is, also, being assigned projects under other Schemes in hill States including States in the North East Region and Andaman & Nicobar Islands. Accordingly, NHs are entrusted to various Executive Agencies through notifications in the Gazette of India. All such notifications are listed as under:-