All national highways in India are rationalised based on the US Highway numbering system. All highways are numbered based on their orientation from North to South and from East to West directions. Highways which are running from north to south are given even numbers and those running in the east-west direction are given odd numbers.
The Primary National Highways which are in N-S and E-W directions are given double digits for better identification by commuters (from 1 to 99). The numbers of the Primary National Highways increase from N-S and E-W. The Secondary National Highways are given three digit numbers.
As per the new scheme, multiple highways are merged into one new Highway. After the renumbering single longest national highway is NH 44 which will run from Srinagar to Kaniyakumari. The shortest Highway is NH-36. The distance is 3.0 km only. Some popular highways are truncated into multiple segments like the Chennai-Bangalore Old Madras Road via Chitoor (NH4) becoming N48-N40-N73-N75.
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| Rationalisation of Numbering system of national highways |
http://dorth.gov.in/writereaddata/sublinkimages/finaldoc6143316640.pdf
http://www.flickr.com/photos/arunganesh/4996257774/
http://en.wikipedia.org/wiki/List_of_National_Highways_in_India#Rationalization_of_Highway_numbers
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