High Quality Content by WIKIPEDIA articles! National Highway 210 is a National Highway in Southern India entirely within the state of Tamil Nadu. NH 210 runs from Trichy to Ramanathapuram in Tamil Nadu. Municipal office road in Trichy becomes NH 210 which on its way south east crosses the major towns Pudukottai and Karaikkudi and finally joins East Coast Road at Devipattinam. Trichy International Airport is located on this National Highway within the Trichy city limit.