Chennai–Thiruvallur High Road, formerly known as Madras–Thiruvallur High Road, is one of the chief routes connecting the northwestern suburbs of Chennai, India. Starting from Padi Junction, the road connects the neighbourhoods of Padi, Ambattur, Thirumullaivoyil, Avadi, Pattabiram, Thirunindravur, and Thiruvallur. It is one of the four national highways that radiates out of Chennai city and is part of National Highway 205.