National Highway in India
National Highway 3, or NH 3, is a national highway in India. It starts from Atari adjacent to India-Pakistan border and near Amritsar and terminates at Leh in Ladakh, via Manali in Himachal Pradesh.
History.
After renumbering of all national highways by National Highway Authority of India in 2010, parts of the former NH 1 and NH 70 have been combined with parts of former NH 21 to create the new NH 3.
Mountain passes.
Part of national Highway 3 runs through the upper reaches of Himachal Pradesh and Ladakh, crossing some high elevation mountain passes. First major pass comes after Manali, which is Rohtang pass at an elevation of 3,978 m. Rohtang pass provides connectivity between the Kullu valley and the Lahaul and Spiti valleys of Himachal Pradesh. Next major pass on NH3 is Baralacha La at an elevation of 4,890 m in Zanskar range. In Leh district, NH 3 crosses over Nakee La (4739 m, 15547 ft), Lachulung La (5064 m, 16616 ft) and Taglang La.
Route.
National Highway 3 route runs through three states. 
Attari, Amritsar, Jalandhar, Hoshiarpur - H.P. border (178.44 km).
Punjab border - Gagret, Amb, Nadaun, Hamirpur, Tauni Devi, Awah Devi, Sarkaghat, Kotli, Mandi, Kullu, Manali, Gramphoo, Kyelong - J &amp; K border (208 km).
H.P border - Leh (170 km).
Construction and upgradation.
Process for upgrading of road from two to four lanes on Jalandhar to Hoshiarpur section was started by NHAI to improve connectivity. Traffic congestion is encountered at Adampur and Rama Mandi on this 58 km stretch. 39.4 km of this project is assigned to the public works department, Punjab.
 Terminal at Wagah India/Pakistan border.
 near Amritsar
 near Amritsar
 near Amritsar
 near Jalandhar
 near Jalandhar
 near Jalandhar
 near Hoshiarpur
 near Hoshiarpur
 near Mubarakpur
 near Nadaun
 near Hamirpur
 near Aut
 near Gramphoo
 Terminal point near Leh
References.
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