NHAI revises width for Kilambakkam-Mahindra City Elevated Corridor Project in Tamil Nadu October 23, 2025 | News & Developments The National Highways Authority of India (NHAI) has revised the width of Kilambakkam-Mahindra City Elevated Corridor Project on Chennai’s Grand Southern Trunk (GST) Road from 25 m to 29 m. This content is restricted.