A massive 2-km stretch of the Pallavaram-Thoraipakkam Radial Road will be replaced by a six-lane elevated bridge to restore the Pallikaranai marshland and mitigate urban flooding.

  • A 2-km stretch of the Radial Road will be replaced by a 6-lane elevated structure.
  • The project cost is estimated at ₹450 crore with a 2-year construction timeline.
  • The move aims to restore 7 hectares of marshland to prevent seasonal flooding.

In a landmark move for urban environmental management, a 2-km segment of the Pallavaram-Thoraipakkam Radial Road—stretching from Chennai One to the Kamakshi Hospital junction—is slated for removal. This strategic decision will allow the Pallikaranai marshland to reclaim approximately seven hectares of land, enabling floodwaters to flow unimpeded through the ecosystem.

According to sources within the Highways Department, the Detailed Project Report (DPR) for the proposed six-lane elevated facility is nearing completion. The structure is designed to commence ahead of Chennai One on the Thoraipakkam side and terminate 100 meters past the Kamakshi Hospital junction flyover. To minimize the environmental footprint, the bridge will feature 200-meter long spans, significantly reducing the number of required piers.

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Why This Matters

BozokMedia analysis shows that this project represents a paradigm shift in Indian urban planning, prioritizing ecological restoration alongside transit efficiency. Currently, this artery facilitates the movement of nearly 1.25 lakh vehicles daily. By removing the road, the city aims to provide long-awaited relief to residents of Velachery, Madipakkam, and Ram Nagar, who suffer from chronic annual flooding due to obstructed natural drainage.

This is perhaps the first time that an existing road is being removed for the sake of the environment.

The technical necessity for this project stems from inadequate drainage infrastructure. Currently, out of the 2100-meter stretch, only 90 meters consist of culverts, which is insufficient to handle the 15,000 cusecs of water that must flow toward Okkiyam Maduvu. The transition to an elevated structure ensures that traffic flow remains uninterrupted while the ground level is returned to its natural state.

Historical Background

Retrospective analysis by retired engineers reveals that much of Chennai's radial road network was planned decades ago under the Madras Area Traffic Study Unit. Many of these roads, including the current Radial Road, were constructed using building debris and waste, often without a comprehensive understanding of how the underlying marshlands would behave over time. This lack of ecological foresight contributed to the current drainage and stability issues.

Did You Know?: The Pallikaranai marshland acts as a natural sponge for Chennai, absorbing massive amounts of rainwater during the monsoon season.

Frequently Asked Questions

1. How much will the new bridge cost?
The estimated civil cost for the elevated structure is approximately ₹450 crore.

2. Will there be land acquisition issues?
No, the project is expected to take two years as no land acquisition is required; only traffic diversions will be necessary during construction.