The ring of roads linking Guindy, Vadapalani, Koyambedu and Anna Nagar is served by two distinct groups of MTC buses. Route 570 follows 100 Feet Road from Ekkattuthangal through Kasi Theatre, Ashok Nagar and Vadapalani to CMBT, while 70A and M70V use the Inner Ring Road line through CIPET, Jaffarkhanpet, MMDA Colony and Koyambedu School to Thirumangalam and Ambattur Estate. 70A is the most frequent of the long routes, with a bus every 13 minutes on average in MTC route data.
This guide maps which routes serve which junction, where they cross the Green Line metro, and which short routes fill the gaps around Vadapalani and Koyambedu. Frequencies in this guide are averages from the MTC route data on each route page and may be dated; check live timings in the Chennai One app or with MTC before you travel.
Two parallel lines through the west side
MTC stop lists show two ways through. The 100 Feet Road group, led by 570, runs Guindy Industrial Estate, SIPCOT Olympia and CIPET, Ekkattuthangal, Kalaimagal Nagar, Kasi Theatre, BSNL, Udhayam Theatre, Ashok Nagar, Vadapalani, Thirunagar and MMDA Arumbakkam to CMBT. The Inner Ring Road group, 70A, M70V and G70, shares the CIPET and Jaffarkhanpet stops and then 70A and M70V head north through the junction of 3rd and 1st Avenue, MMDA Colony, Koyambedu School and Thirumangalam.
G70 turns at Jaffarkhanpet towards the PTR Road and Kamaraj Road junction and Vadapalani. M70V is the short version of the ring run, 18 km from Guindy TVK Estate to Ambattur Estate. 70A is the long one, starting at Avadi and continuing south past St Thomas Mount, the airport and Tambaram to Vandalur Zoo.
| Route | Ends | Length | Average gap | Ring section |
|---|---|---|---|---|
| 70A | Avadi to Vandalur Zoo | 45.9 km | 13 min | CIPET to Ambattur Estate |
| 570 | CMBT to Kelambakkam | 40.5 km | 13-14 min | Guindy to CMBT via 100 Feet Road |
| G70 | Vadapalani to Guduvanchery | 33 km | 19 min | Vadapalani, Jaffarkhanpet, CIPET, Guindy |
| S31 | Vadapalani to CMBT | 10.7 km | 19 min | Vadapalani, Virugambakkam, Koyambedu |
| M70V | Guindy TVK Estate to Ambattur Estate | 18 km | 30 min | Guindy to Ambattur Estate |
| M27ET | Vadapalani to Thiruverkadu | 17.7 km | 2 hrs | Vadapalani, Koyambedu, CMBT |
| 41C | Anna Nagar West to Thiruvanmiyur | 20.3 km | 2.2 hrs | Anna Nagar Circle, Thirumangalam |
Source: MTC route data via Spirit of Chennai route pages, opened 19 October 2026. Gaps are averages and may be dated.
Vadapalani and Koyambedu: the short links
Two small routes knit the hubs together. S31 runs 10.7 km from Vadapalani bus stand through Virugambakkam and Chinmaya Nagar to Koyambedu police station and CMBT. M27ET follows the same Vadapalani to CMBT path, then heads west along Poonamallee High Road to Thiruverkadu. At the north end, 41C links Thirumangalam and Anna Nagar Circle with Aminjikarai and Luz on its way to Thiruvanmiyur.
Timings differ along the ring. The 70A and M70V pages list a 5 a.m. first bus from both ends. 570 starts at 4.50 a.m. from CMBT but its last bus from CMBT is listed at 7.30 p.m., so for a late trip from Koyambedu towards Guindy the Green Line or M70V is the better bet.
Average gap on route 70A, which runs 45.9 km from Avadi via the Inner Ring Road, the airport and Tambaram to Vandalur Zoo, per MTC route data.
Changing to the metro
The CMRL station list puts seven Green Line stations on this ring: Thirumangalam, Koyambedu, CMBT, Arumbakkam, Vadapalani, Ashok Nagar and Ekkattuthangal, before the line reaches Alandur and St Thomas Mount. Vadapalani is now a two-line station, since the Yellow Line from Poonamallee that opened on 11 October 2026 ends there and interchanges with the Green Line, DT Next reported.
CMRL’s Metro Connect list adds three small-bus links at the north end: S70K from Thirumangalam Metro towards Padi and Korattur, S51 from Koyambedu Metro to Nolambur, and S60 from CMBT Metro to Maduravoyal. The AC electric buses flagged off on 25 August 2026 included 70V from Koyambedu to Kilambakkam and D70 from Ambattur Industrial Estate to Velachery, DT Next reported.
- Guindy to Vadapalani along 100 Feet Road: 570 or G70.
- Guindy to Thirumangalam or Ambattur Estate: M70V or 70A.
- Vadapalani to CMBT: S31 or M27ET, or two stops on the Green Line.
- Long trips around the ring: the Green Line covers Ekkattuthangal to Thirumangalam with fewer stops.
Quick answers
Which bus goes from Guindy to Koyambedu?
570 runs Guindy Industrial Estate to CMBT via Ekkattuthangal, Ashok Nagar and Vadapalani. 70A and M70V reach Koyambedu School via CIPET and Jaffarkhanpet.
Which bus goes from Vadapalani to CMBT?
S31, 10.7 km via Virugambakkam, averaging a bus every 19 minutes in MTC route data.
Which bus runs from Guindy to Anna Nagar West and Ambattur?
M70V, Guindy TVK Estate to Ambattur Estate via Thirumangalam, 18 km.
Information checked against official sources on 19 October 2026. Routes, timings and fares can change; confirm on the linked official pages or in the Chennai One app before travelling.
Sources
- Route 570: CMBT to Kelambakkam (MTC route data via Spirit of Chennai route page)
- Route 70A: Avadi to Vandalur Zoo (MTC route data via Spirit of Chennai route page)
- Route M70V: Guindy TVK Estate to Ambattur Estate (MTC route data via Spirit of Chennai route page)
- Route G70: Vadapalani to Guduvanchery (MTC route data via Spirit of Chennai route page)
- Route S31: Vadapalani to CMBT (MTC route data via Spirit of Chennai route page)
- Route M27ET: Vadapalani to Thiruverkadu (MTC route data via Spirit of Chennai route page)
- Route 41C: Anna Nagar West to Thiruvanmiyur (MTC route data via Spirit of Chennai route page)
- Chennai Metro Rail: operational lines and stations (CMRL)
- Metro Connect feeder services and MTC small buses (CMRL)
- Metropolitan Transport Corporation, Chennai (Government of Tamil Nadu)
- Vadapalani-Poonamallee Metro: key features, station list and train timings (DT Next)
- CM Vijay flags off 130 new AC electric and 120 regular buses in Chennai (DT Next)
