As you want to go at IIT madras by bus route but did not metion your start point from where you are, anyways , here I am telling IIT madras campus is located on the Sardar Patel Road, midway between the Raj Bhavan and Adyar bus terminus and is around 12 km from Chennai Central Railway Station. The bus stop is just across the road from the Central Railway Station.

There are direct buses to IIT madras, which start at the Central Station bus stop. If you take any of them, get down at Gandhi Mandapam, which is at walking distance from the IIT madras main gate.

Otherwise, take any bus to Saidapet and from there, any bus heading for Adyar or Besant Nagar which will drop you right in front of the IIT madras gate. You could also take any bus to Adyar; there are frequent buses from Adyar Signal to the campus. Once you reach the In gate, there are buses to Gajendra Circle (near the administrative block and Central Library), the academic zone and the hostels (they are around 3.8 km from the main gate!) almost every 30 minutes.


From To Buses Nos.
Central Station Gandhi Mandapam, IIT, Adyar 18B, 19S
Saidapet IIT, Besant Nagar 5B, 23C, 47A, 47
Egmore Station IIT, Adyar 23C, 23E, 23A, 23G
Adyar Traffic Signal IIT 1LSS, 4LSS, 6LSS

Address

Indian Institute of Technology Madras
Beside Adyar Cancer Institute
Opposite to C.L.R.I
Sardar Patel Road, Adyar
Chennai, Tamil Nadu 600036