Delhi marks the last leg of the NH 1. It enters Delhi at the Singhu Border in the northern district and passes through all of North Delhi up to the ISBT Kashmiri Gate. There it merges into the Ring Road and proceeds beyond as NH 2, up to the Bangladesh border. In Delhi, the region through which the highway passes is the most underdeveloped and encroached district of the city. It is mostly industrial and ill-planned. The Guru Tegh Bahadur Memorial falls along the NH 1 close to the Singhu Border, in Delhi.

NH 1 in Punjab
NH 1 in Delhi
NH 1 in Haryana
Spur Routes of NH 1