It starts from its junction with NH 16 near Chennai in Tamil Nadu and terminates at its junction with NH 67 near Muddanur in Andhra Pradesh.

[2][3][4] It starts at Chennai in Tamil Nadu and terminates at Muddanur in Andhra Pradesh.

It has a total route length of 319.3 km (198.4 mi).

[5][6] Chennai, Tiruvallur, Tiruttani - A. P. border.

T. N. border - Puttur, Tirupati, Mamanduru, Settigunta, Koduru, Pullampeta, Rajampet, Nandalur, Madhavaram, Vonimitta, Bhakarapet, Kadapa (Cuddapah), Yerraguntla, Muddanur[7]