National Highway 79 (India)  National Highway 79 (NH 79) is a National Highway in India entirely within the state of Tamil Nadu. It runs between Ulundurpettai and Salem in the Indian state of Tamil Nadu for a total of . It connects with NH 44 and NH 544 at Salem. NH 79 connects NH 68 and SH 69 at Ulundurpettai and SH 6 at kallakurichi. It was upgraded to a dual carriageway road in two phases on a Build-operate-transfer basis by Reliance Infrastructure and Maytas. NH 79 is an important connecting road for vehicles travelling from the two major cities of Coimbatore and Kochi. NH 79 connects Salem, in directly Coimbatore, Erode, Tirupur and the cities around these areas with Chennai. Ulundurpettai - Elavanasur kottai - Thiyagadurgam - Kallakurichi - Chinnasalem, Thalaivasal - Kattukottai - Attur - Pethanaickenpalayam - Vazhapadi - Salem. NH 79 on OpenStreetMap