iving a fillip to the long-pending 133-km peripheral ring road project between Singaperumal Koil and Mamallapuram, authorities have floated tenders for the final 30-km stretch. Proposed in 2019, the corridor will link Mahabalipuram with Ennore via Singaperumal Koil, Sriperumbudur, and Tiruvallur. The estimated project cost is ?15,000 crore, and officials expect completion within the next two years.

According to officials, work on the last stretch will begin soon and is expected to be completed within two years, followed by a seven-year maintenance period. More than 1,000 trees located along the right-of-way of the six-lane corridor — which can later be expanded to 10 lanes — have been identified for transplantation along the service lanes.

Four other stretches — Ennore–Thatchur, Thatchur–Thamaraipakkam, Tiruvallur–Sriperumbudur, and Sriperumbudur–Singaperumal Koil — have already been tendered. Some sections have achieved progress of up to 70%. The full corridor will feature 55 vehicular underpasses and multiple entry and exit points in key towns.

While national highways generally limit speed to 100 kmph, this corridor will permit 120 kmph, making it the first expressway of the state road network. The only other corridor with a similar speed limit is a national expressway under construction between Chennai and Bengaluru.

Once operational, travel time between Mahabalipuram and Ennore — currently around three hours via the 75-km route through the city — is expected to reduce to roughly one hour.