National Highway 81, commonly referred to as NH 81, is a highway connecting the city of Coimbatore to Chidambaram in South India.

[1] This highway was previously part of old national highways 67 and 227 but subsequent to rationalisation of national highway numbers of India by Gazette notification on 5 March 2010 it was changed to National Highway 81.

[2] This national highway is 321.4 km (199.7 mi) long and runs entirely in the Indian state of Tamil Nadu.

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