Today in Transportation History – 2008: Separating the Grade in Tamil Nadu

In southern India, a grade separator (better known in the United States as an interchange) was fully opened at a major highway junction in the city of Chennai in the state of Tamil Nadu. This cloverleaf grade separator is called Kathipara Junction, and it was formally inaugurated by Tamil Nadu’s chief minister Muthuvel Karunanidhi.

Kathipara Junction is located in Chennai’s neighborhood of Alandur, specifically at the intersection of the Grand Southern Trunk Road, Inner Ring Road, Anna Salai (an arterial route formerly known as St. Thomas Mount Road), and Poonamallee High Road. The grade separator replaced a roundabout that featured a statue of Jawaharlal Nehru, who was a central figure in Indian politics and the nation’s first prime minister.

Kathipara Junction was built as part of national plan to reduce traffic congestion and improve connectivity throughout India. Nearly seven months before Kathipara Junction was opened in its entirety, vehicles were first allowed to travel on the main span of the grade separator’s flyover (widely referenced in the United States as an overpass). This main span links the Inner Ring Road with the Great Southern Trunk Road. Kathipara Junction’s flyover holds the record for the largest cloverleaf flyover in all of Asia.

For more information about Kathipara Junction, please check out

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