 According to the system all north–south oriented highway will have even numbers increasing from the east to the west.Similarly all east–west oriented highways will be odd numbered increasing from the north to the south of the country.The longest National Highway under the old numbering scheme was the NH 7 which was from Varanasi to Kanyakumari passing through Uttar Pradesh, Madhya Pradesh, Maharashtra, Telangana, Andhra Pradesh, Karnataka and Tamil Nadu covering a distance of , as of Sep 2011 as per National Highways Authority of India.