Grand Southern Trunk Road or National Highway 45 is an arterial road in the Indian state of Tamil Nadu. It is also known as Chennai–Trichy Highway. The road starts from Kathipara Junction in St Thomas Mount, Chennai towards Tiruchirappalli. It branches out from Anna Salai (previously known as Mount Road).
The road runs through important localities like Meenambakkam, Pallavaram, Kadaperi, Tambaram, Vandalur, Kilambakkam, Guduvanchery, Paranur, Chengalpattu, Madurantakam, Tindivanam, Villupuram, Vikravandi Ulundurpet and Perambalur.
Major junctions
Chennai City
Mount-Poonamallee Road near Kathipara Junction
Mount-Medavakkam High Road in St.Thomas Mount
Pallavaram-Kundrathur-Poonamallee Road (Pammal Main Road) in Pallavaram
Pallavaram-Thiruneermalai Road in Pallavaram
Pallavaram-Thuraipakkam Radial Road in Pallavaram
Chitlapakkam and Hasthinapuram Main Road near MIT Bridge Along GST Road
Gandhi Road in Tambaram
Velachery Main Road and Mudichur Road in Tambaram
Chennai Bypass Road in Irumbuliyur
Chennai Outer Ring Road in Vandalur
Vandalur-Kelambakkam Road in Vandalur
Guduvancheri Tiruporur
Kotteripattu Near Tindivanam
Developments
NHAI to repair Palar Bridge in Grand Southern Trunk Road near Chengalpattu. Double Deck Structure proposed between Airport and Irumbuliyur along GST Road. NHAI set to rectify 18 accident-prone spots in GST Road.