Chennai–Thiruvallur High Road

The road begins at Padi junction in Chennai and runs about 22 km in the Chennai metropolitan area (CMA) up to Thirunindravur, from where it runs a further 59 km to reach Tiruttani. According to official Indian Roads Congress norms, this road is supposed to be wide, but currently it is only wide in many stretches. ==Road Transfer and Developments==

The Chennai–Thiruvallur High Road (CTH Road), originally part of NH-205 (later renumbered NH‑716), was de-notified as a National Highway due to expansion limitations and transferred to the Tamil Nadu State Highways Department in 2013. The stretch for 22 kms from Padi to Thirunindravur, is now classified as State Highway Urban 148 (SH-U 148) and maintained by the State Highways (Construction and Maintenance) Department. In 2013, the Tamil Nadu government proposed widening the Padi–Thiruninravur stretch into a six-lane road, with the first phase involving four-laning with a center median at a cost of ₹98 crore. However, the plan faced opposition from local traders’ associations, including the Tamil Nadu Vanigar Sangankalin Peravai, leading to project delays for many years. In May 2025, land acquisition notices were issued to 153 property owners in Thirumullaivoyal for acquiring 3.5 acres as part of the expansion process. Public consultations were scheduled for June 5, 2025. The move marked the formal resumption of the widening project, which had seen limited progress in earlier years. ==Landmarks and Urban Development==

CTH Road passes through key suburban and industrial areas of Chennai, including Ambattur, Avadi, and Thiruninravur. The road is already home to the well-established Ambattur Industrial Estate, one of South India's largest Small and Medium-scale Industrial Hubs and home to some of the data centers. In addition, TIDEL Park Pattabiram, a 21-storey IT complex is the tallest building along the stretch. This IT park is expected to enhance employment opportunities and spur commercial growth in the western corridor of the city. Road-over Bridges and Metro Connectivity In 2019, the Tamil Nadu Highways Department planned four flyovers on the 22-km road via key junctions at Padi, Ambattur Estate, Dunlop and Avadi. In 2025, following Chennai Metro's plan to construct a metro corridor from Koyambedu to Pattabiram, the highways department revised its project by planning to integrate three of the four planned flyovers with metro line and additionally expand two railway overbridges. == Gallery ==

File:Ambattur Estate Bus Terminus.jpg|Aerial view of Ambattur Estate Bus stand from CTH road File:CTH Road stretch near Ambattur OT bus stand.jpg|CTH Road stretch at Ambattur OT bus stand File:Ambattur OT Singapore Complex junction.jpg|Ambattur OT-Redhills Road junction near Singappore Shopping complex File:Tidel Park Pattabiram.png|TIDEL Park, Pattabiram seen from CTH Road ==See also==