The Padi Junction is one of the important junctions in Chennai

Chennai

Chennai , formerly known as Madras or Madarasapatinam , is the capital city of the Indian state of Tamil Nadu, located on the Coromandel Coast off the Bay of Bengal. Chennai is the fourth most populous metropolitan area and the sixth most populous city in India...

. It is located north of Koyambedu Junction

Koyambedu junction

Koyambedu Junction or otherwise called the Koyambedu Roundtana is an important road junction in Chennai, state of Tamil Nadu, India. It is located north of the Chennai Mofussil Bus Terminus at the junction of the Inner Ring Road and the Poonamallee High Road in the Koyambedu area/ locality...

 at the intersection of Inner Ring Road (IRR) with Chennai-Tiruvallur High Road (CTH). An elevated rotary has been constructed at this junction as part of the NHDP by NHAI to ease the traffic congestion. It was built at a cost of 1,300 million and was opened for traffic on 20 February 2009.

Grade separator

The junction is used by hundreds of heavy vehicles and the has a traffic density of about 200,000 passenger car units daily. To ease the congestion, the NHAI has constructed an elevated four-lane rotary at the junction. Work on the project began in 2005 and completed in 2009.

Ramps
A total of six ramps and an elevated rotary with 100 spans form part of the elevated structure.

Along IRR

• Four ramps on each side of the IRR and on both sides of the grade separator.
• The ramps are all two-laned and are for One-way traffic
  One-way traffic
  One-way traffic is traffic that moves in a single direction. A one-way street is a street either facilitating only one-way traffic, or designed to direct vehicles to move in one direction.-General signs:...
  
  .

Along CTH Road

• Two ramps along the median of the CTH road on both sides of the grade separator.
• The two ramps on CTH road are all four-laned with a median for two-way traffic.
• The ramp on the north of the grade separator on CTH road crosses a railway line.
• An elevated 4-laned rotary at the center connects all the 6 ramps and has an outer radius of 99 metres.