Tamil Nadu State Transport Corporation Limited (TNSTC) (Tamil:தமிழ்நாடு அரசுப் போக்குவரத்து கழகம்) is a public transport bus operator in Tamil Nadu, India. It is the largest bus corporation in the world and operates buses along intra and inter city bus routes in South India.
TNSTC is the largest government bus transport corporation in world with an estimated 21,594 buses in its fleet. It is fully owned and operated by Government of Tamil Nadu. It caters to all the districts within Tamil Nadu and also operates services to neighboring states of Andhra Pradesh, Karnataka, Kerala, Telangana and union territory of Puduchery. .Until 1996, transport corporation was bifurcated into 21 divisions which was later merged to form 8 divisions. School and college students get a free bus pass to travel on TNSTC buses. TNSTC owns 321 depots and five workshops. TNSTC also offers contract and tourist services. Every bus owned by the corporation displays a portrait of Tamil poet Thiruvalluvar along with a two line verse from Thirukkural inside the bus.
TNSTC operates buses of various classes to cater to different sections of public:
Town buses and low floor buses, operated on intra city routes
Moffusil buses, largest in its stable, ply on inter town routes and cater to a majority of the traffic
Video coaches and deluxe buses operated between major towns.
Ultra deluxe non AC coaches with recliner seats, operated between important commercial centers to major cities.
Air conditioned buses operated in intra city routes operated by TNSTC.
SETC operates Air conditioned buses from all district head quarters to Chennai.
TNSTC and SETC use custom made buses built on Ashok Leyland and TATA supplied chassis. Air conditioned buses for intra city routes in Chennai are supplied by Volvo and Tata Marcopolo. All divisions have individual own coach building units.