[1] It runs between Ulundurpettai and Salem in the Indian state of Tamil Nadu for a total of 134 km (83 mi).

It was upgraded to a dual carriageway road in two phases on a Build-operate-transfer basis by Reliance Infrastructure and Maytas.

[3] NH 79 is an important connecting road for vehicles travelling from the two major cities of Coimbatore and Kochi.

NH 79 directly connects Salem with Chennai, and indirectly Coimbatore, Erode, Tirupur and the cities around these areas.

Ulundurpettai - Elavanasur kottai - Thiyagadurgam - Kallakurichi - Chinnasalem, Thalaivasal - Kattukottai - Attur - Pethanaickenpalayam - Vazhapadi - Salem.