The Golden Quadrilateral is a major highway network project in India that connects the four major metropolitan cities: Delhi (north), Kolkata (east), Mumbai (west), and Chennai (south), thus forming a quadrilateral. It is the largest highway project in India and the fifth-longest in the world.
Managed by the National Highways Authority of India (NHAI), its primary objective was to reduce travel time and distance between these major industrial, agricultural, and cultural centers. The project, largely completed in 2012, consists of four- and six-lane express highways built to world-class standards.
The Golden Quadrilateral has significantly boosted economic activity by enabling faster movement of goods and people, reducing vehicle operating costs, and promoting industrial growth along its corridors.