The IRR is a 6 lane road with different modes of mass transits planned along the median in different arms. It is 30 km long with the section between OTA and Kathipara Junction (1.5 km) being shared with NH 45.
The northern arm of IRR starts from Padi Junction and joins SH 104 (TPP) near Manali. It connects NH5 at Madhavaram Junction. A part of the elevated BRTS is planned along the median of this arm. This section is being strengthened by the NHAI as a part of the port connectivity project.
The CMBT in Koyambedu is the terminus for all intercity bus services from Chennai. It is one of the largest bus station in Asia and is accredited with the ISO 9001:2000 quality certification for its quality management and excellence.
The southern arm of IRR extends from IT corridor in the form of Taramani Link Road and joins NH 45 at Officers Training Academy before ending at Kathipara Junction. This section is under construction. The Taramani Link Road is being six-laned under TNUDP-III with World Bank assistance while the section from Velachery MRTS station to OTA is being developed newly by the State Highways department. The MRTS Phase II extension is under construction along the median of the this section. A Rapid bus way is planned along the Taramani Link Road.