This road running from the capital city of Port Blair to Diglipur connecting all major towns of Ferrargunj, Baratang, Kadamtala, Rangat, Billy Ground, Nimbudera, Mayabunder and Diglipur.

Prior 1970s to early 1990s transportation of men and goods used to take several days by sea route now can be completed in a matter of 10–12 hours.

NH-4 facilitates movement of essential commodities, access to health care facilities, etc.

ATR passes through the buffer zone of the Jarwa Reserve between Jirkatang to the Middle Strait where laws are in place to minimize traveler contact with the native tribe of Jarawa.

[3] A stretch of national highway from Mumbai to Pune to Hubli to Bangalore to Chennai was earlier called NH 4 before renumbering of national highways in 2010.