A double-decker elevated rood-cum-metro line is likely to come up on the Poonamallee-Sriperumbudur section of Chennai-Bengaluru Highway, with the metro trains plying on the second level towards the proposed Parandur Greenfield Airport over the road on the first level.

Chennai Metro Rail Ltd (CMRL) has proposed to construct an elevated metro corridor from Poonamallee to Parandur in the Kancheepuram district along the NH4, on which the NHAI has planned to construct an elevated road from Maduravoyal to Sriperumbudur via Poonamallee
With the CMRL proposing integration of its new corridor, the NHAI has decided to put on hold a portion of the elevated road from Poonamallee to Sriperumbudur, NHAI sources said.

A senior official of CMRL said they have decided to integrate the Poonamallee- Parandur metro project with the NHAI's elevated rood so they can avoid land acquisition.

"The NHAI is planning to construct an elevated road from Maduravoyal to Sriperumbudur. We wanted to integrate the corridor from Poonamallee to Pararidur. If the plan works out, the metro and elevated road would be a double- decker till Sriperumbudur, where the elevated road ends. While the metro comidor would continue on the NH4 till Neervalur and take a right towards the proposed Porandur airport," the official said.