Not all MTC routes are created equal. Some routes carry tens of thousands of passengers every day, running buses back to back with barely a five-minute gap. If you commute on any of these corridors, you already know the drill — push, hold the bar, and pray for a seat. Here are the ten busiest MTC bus routes in Chennai, based on frequency, ridership and the corridors they serve.
1. Route 21C — Tambaram to Broadway
Route 21C is arguably the single most important MTC route in the city. It connects Tambaram in the south-west to Broadway in the heart of north Chennai, running along Grand Southern Trunk Road (GST Road) through Chromepet, Pallavaram, Meenambakkam, Guindy, Saidapet and T. Nagar. During peak hours, a 21C departs every 3 to 5 minutes from both ends. The route overlaps with the Chennai Metro Blue Line for much of its length, yet bus ridership remains enormous because of the lower fare.
Peak hours: 7:30–10:00 AM, 5:00–8:00 PM. Tip: Board at Tambaram terminus to get a seat. By Chromepet, most seats are gone.
2. Route 101 — Vadapalani to Broadway
Route 101 cuts east–west through the city centre via Kodambakkam, Nungambakkam, Egmore and Broadway. It is a lifeline for people working in the Nungambakkam–Egmore commercial belt. Buses run every 4 to 6 minutes during peak hours.
Why so busy: Nungambakkam and Egmore have a dense concentration of offices, hospitals and courts. The route also connects to Central station, making it a feeder for long-distance rail passengers.
3. Route 5 — Broadway to Thiruvanmiyur
Route 5 runs south-east from Broadway through Triplicane, Mylapore, Adyar and down to Thiruvanmiyur. It serves some of the oldest residential neighbourhoods in Chennai. Every 5 to 7 minutes during peak. IT professionals heading to the Adyar–Thiruvanmiyur belt and students going to colleges along this corridor keep it packed.
4. Route 47 — Broadway to Anna Nagar
Route 47 heads north-west from Broadway through Purasawalkam, Kilpauk and into Anna Nagar. Anna Nagar is one of Chennai's largest planned residential areas, and Route 47 is the most direct bus connection to the city centre. Buses every 5 to 8 minutes.
Tip: The 47A variant extends further to Anna Nagar Western Extension and is equally busy.
5. Route 500 — Tambaram to Broadway via OMR
Route 500 and its variants (500D, 500A) are the primary bus link between the IT corridor on Old Mahabalipuram Road (OMR) and central Chennai. Route 500 runs via Sholinganallur, Perungudi, Velachery and Adambakkam. With the tech-park population on OMR exploding, these buses are perpetually full.
Peak hours: Morning rush starts as early as 7 AM for the IT crowd; evening peak stretches from 6 PM to 9 PM.
6. Route 70 — Broadway to Thiruvanmiyur via Mount Road
Route 70 runs along Mount Road (Anna Salai), one of Chennai's iconic thoroughfares. It serves the Spencer Plaza–LIC–Thousand Lights commercial strip before heading south to Adyar and Thiruvanmiyur. Frequency is roughly 5 to 8 minutes.
Why packed: Mount Road is the commercial spine of Chennai, lined with offices, showrooms and government buildings.
7. Route 21 — Tambaram to Broadway (via different stops from 21C)
Route 21 is the parent route from which 21C was derived. It follows a slightly different path through certain sections, but the core GST Road corridor is the same. Combined, Route 21 and its variants (21A, 21C, 21G, 21H) form the single busiest corridor in the MTC network.
8. Route 108 — Poonamallee to Broadway
Route 108 connects the western suburb of Poonamallee to Broadway via Koyambedu, Vadapalani and Kodambakkam. It is a vital artery for the Poonamallee–Avadi industrial-residential belt, carrying factory workers, government employees and students.
9. Route 47A — Broadway to Anna Nagar Western Extension
Route 47A extends the 47 corridor further west. It is especially popular among families living in Anna Nagar West and Mogappair East who work in the city centre. Frequency is slightly lower than 47 but still around 6 to 10 minutes during rush hour.
10. Route 500D — Tambaram to Sholinganallur (Deluxe)
Route 500D is the deluxe version of Route 500 and specifically targets the OMR tech corridor. The buses are slightly better maintained and the fare is marginally higher. IT employees prefer it for the slightly less-manic boarding experience — though "less manic" is relative.
Survival Tips for Busy Routes
- Board at the terminus. If you live near the starting point of a route, use it. You are almost guaranteed a seat.
- Avoid the 8 AM and 6 PM window if your schedule is flexible. Even a 30-minute shift can reduce crowding.
- Consider Deluxe or AC variants. They cost more but are far less crowded.
- Use the stops directory to check which routes serve your stop — there may be a less crowded alternative that takes a slightly longer route.
- Keep your belongings secure. Crowded buses are where you are most likely to lose a phone or wallet.
Timings shown on TN Bus Stand are scheduled departures and may vary due to traffic, weather, or operational changes. Always verify at the bus stand inquiry counter before travelling.