- Anna Flyover
- MIT Flyover
- Alwarpet Flyover
- IIT Madras Flyover
- Doveton Flyover
- Perambur Flyover
- Madhuravoyal grade separator
- Padi grade separator
- Koyambedu grade separator
- Kathipara grade separator
- Tambaram flyover
- Peters Road flyover
- Conran Smith Road flyover
- Dr. Radhakrishnan Road flyover
- Music Academy flyover
- Panagal Park flyover
- TTK Road flyover
- Mahalingapuram flyover
- Pantheon Road flyover
- Thirumangalam flyover
- Moolakkadai flyover
- Vandalur flyover
- Airport flyover
- Pallavaram Flyover
- Pallavaram Railway Station Flyover
- Pallavaram New Unidirectional Flyover
- Vyasarpadi flyover
- Mint flyover
- G N Chetty Road flyover
- Velachery Taramani Road - Kamakshi Hospital Junction flyover
- Medavakkam Junction flyover
- Keelkattalai flyover
- Tambaram Sanitorium (Bharatha Matha Street) flyover
- Kilkattalai - Pallavaram Radial Road Junction flyover
- Velachery Junction flyover
- Vadapalani Junction flyover
- Porur flyover
- Anna Arch flyover - Arumbakkam
- Anna Arch flyover Aminjikarai
- Koyambedu CMBT flyover
All are of recent years, other than Anna Flyover.
Between 2005 and 2014, the state government has spent over ₹15,590 million erecting flyovers and grade separators, of which ₹11,440 million (88%) was invested in Chennai. The city hosts all 21 elevated urban corridors open to traffic in the state in 2014. ( i don't have information on 2014 to 2020).
Now the new flyovers planned are Kattupakkam, Akkarai, Ambattur, Avadi, Madhavaram, Ramapuram, Kundrathur, Kaiveli, Selaiyur, Korattur, Vadapalani-P.T. Rajan Salai junction, Madhya Kailash and Madipakkam.
If Chennai region itself taking 80% to 90% of infra development work with regard to traffic mgmt, i think, the correct name should be Chennai Govt.
But still , To not hurt feelings of even minority number of forum members here, i have no issue using the name "Tamilnadu govt" itself though..
Just to compare, Avadi / Ambattur is several kilometers away from Chennai. It is having better infra than Saravanampatti, which is exactly at 10kms from Coimbatore railway station/Bus Stand.
Note: - All information is from open source like Wiki.