St. Thomas Mount-Poonamallee Road, popularly known as the Mount-Poonamallee Road (SH-55), is an arterial road in the city of Chennai, India. It runs for 11 kilometres from Kathipara Junction to the NH 4 highway connecting St. Thomas Mount with the suburb of Poonamallee. About 5 kilometres of the Mount-Poonamallee Road is located in the Alandur taluk of Chennai district, part of Maduravoyal Taluk in Chennai district and the remainder in the Poonamallee taluk of Thiruvallur district. Features The road is divided into two sections. The first section from St. Thomas Mount to Nandambakkam covering a distance of one kilometre is more narrow than the rest of the stretch and is known as Butt Road. Places transversed St. Thomas Mount Nandambakkam Ramapuram Manapakkam Mugalivakkam Porur Iyyappanthangal Kattupakkam Karayanchavadi Kumananchavadi Poonamallee See also Transport in Chennai References Roads in Chennai