Although, the geography of Himachal presents considerable challenge to the development of transport infrastructure, it has the highest road density among all the Hill States of India.
Kinnaur was opened up in the early 1960s with the completion of the NH-5 Hindustan-Tibet National highway from Ferozepur in Punjab to Shipki La.
In January 1991, Himachal was linked up with the broad gauge system by extending the Delhi-Nangal rail line.
The border districts, located near the borders of Tibet and Indian union territories of Ladakh and Jammu and Kashmir, such as Kinnaur, Lahaul, Spiti and the Pangi and Bharmour tehsils of Chamba districts are the major underdeveloped and underserved tribal areas of the state.
Some of the roads in Himachal are seasonal and get closed during winters and monsoons due to heavy snowfall, landslides and washouts.