| National Highway | Cities connected |
|---|---|
| 1. NH 4 | Chennai and Hyderabad |
| 2. NH 6 | Mumbai and Kolkata |
| 3. NH 15 | Ahmedabad and Jodhpur |
None of the pairs are correctly matched.
Pair 1: NH 4 (under the old numbering system) connected Mumbai and Chennai. The given pair incorrectly states Chennai and Hyderabad.
Pair 2: NH 6 (under the old numbering system) connected Surat and Kolkata. The given pair incorrectly states Mumbai and Kolkata.
Pair 3: NH 15 (under the old numbering system) extended from Samakhiali (Gujarat) to Pathankot (Punjab). It did not directly connect Ahmedabad and Jodhpur.
Note: The National Highway numbering system was revised in 2010. Under the new system, the old NH 4 became part of NH 48, the old NH 6 became part of NH 53, and the old NH 15 is now partially covered by NH 27 and NH 62.