Which National Highway number in India is historically known as Sher Shah Suri Marg, a part of the Grand Trunk Road?

Introduction / Context:
Sher Shah Suri, the Afghan ruler of North India in the sixteenth century, is well known for improving and extending the ancient route known as the Grand Trunk Road. Parts of this historic road later became sections of modern National Highways. Many general knowledge questions ask students to connect Sher Shah Suri Marg with the correct National Highway number in the pre renumbering system, where NH 1 referred to an important north Indian route.

Given Data / Assumptions:

• The question asks which National Highway is called Sher Shah Suri Marg.
• The options are NH 1, NH 3, NH 7, and NH 5, based on the older National Highway numbering scheme.
• Sher Shah Suri Marg is historically identified with part of the Grand Trunk Road connecting Delhi with the northwestern frontier.
• We assume knowledge of classic school references that join Sher Shah Suri Marg with NH 1.

Concept / Approach:
The concept is to match a historic route with a highway number. Under the earlier numbering, NH 1 ran from Delhi to the Attari border near Amritsar, following a section of the old Grand Trunk Road. This section is frequently named Sher Shah Suri Marg in textbooks and on road signs. Other highways listed in the options, such as NH 3, NH 5, and NH 7, run on different alignments and are not associated in the same way with Sher Shah Suri's improvements to the Grand Trunk Road.

Step-by-Step Solution:
Step 1: Recall that Sher Shah Suri Marg is another name for part of the historical Grand Trunk Road developed during Sher Shah Suri's rule.Step 2: Remember that in the older National Highway system, NH 1 linked Delhi with places in Punjab up to the Indo Pakistan border.Step 3: Recognise that this Delhi to Amritsar stretch broadly follows the historic Grand Trunk Road corridor.Step 4: Note that NH 3, NH 5, and NH 7 correspond to different long distance routes that do not carry the same historical label in school references.Step 5: Therefore, identify NH 1 as the highway also called Sher Shah Suri Marg.

Verification / Alternative check:
Many school atlases, wall maps, and competitive exam preparation books label the Delhi Amritsar section of NH 1 as Grand Trunk Road or Sher Shah Suri Marg. Road signs along the route have historically used this name as well. The other listed highway numbers are associated with central and southern routes and do not appear in connection with Sher Shah Suri in standard exam oriented content. This repeated pairing of NH 1 with Sher Shah Suri Marg provides a strong confirmation.

Why Other Options Are Wrong:
NH-3: This highway originally connected Agra with Mumbai via central India and is not associated with Sher Shah Suri Marg in textbooks.
NH-7: Under the old system, NH 7 ran from Varanasi to Kanyakumari through central and southern India, far from the Grand Trunk Road corridor.
NH-5: This route mainly followed the eastern coastal corridor and does not match the historic path of Sher Shah Suri Marg.

Common Pitfalls:
Students may confuse the modern renumbered National Highways with older numbers or may think of Sher Shah Suri Marg simply as any long north south road. Another pitfall is to guess NH 7 because it was one of the longest highways, even though its alignment does not match the Grand Trunk Road. To avoid mistakes, it helps to remember the specific connection between NH 1, the Delhi Punjab arterial route, and the historic Grand Trunk Road developed under Sher Shah Suri.

Final Answer:
The National Highway historically known as Sher Shah Suri Marg, representing a part of the Grand Trunk Road, is NH-1.