DEC 10, 2023

rohit

All the highways running in the East-West direction have odd numbers
Eg. NH7 (Punjab to Uttarakhand)
For odd number highways, the numbers are in an ascending order from North to South.
Eg. NH1(in J&K), NH11(in Rajasthan) and as we go towards the South the numbers are increasing.

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All the highways running in the North-South direction have even numbers
Eg. NH44 (Srinagar to Kanyakumari)
For even number highways, the numbers are in an ascending order from East to West.
Eg. NH2(in Assam & Mizoram), NH12(in West Bengal) and as we go towards the West the numbers are increasing.

Now the branches of these national highways are denoted by 3 digit numbers
Eg. Let's take NH44
If the first digit is ‘odd’ number, then its a East-West direction branch
like NH144, NH344
If the first digit is ‘even’ number, then its a North-South direction branch
like NH244, NH444

And if more subsidiary highways are there then will add the alphabet at the end of 3 digit highway number, like NH144A, NH344A, NH344B.

Interesting Fact, Indian highway numbering system & US highway numbering system are exactly opposite to each other.
India
North South: Even number
East West: Odd number
Numbers increase from North to South and East to West
US
North South: Odd number
East West: Even number
Numbers increase from South to North and West to East