(2) Hyderabad Explanation: The Golden Quadrilateral is a highway network connecting India's four largest metropolises: Delhi, Mumbai, Chennai and Kolkata, thus forming a quadrilateral of sorts. Four other top ten metropolises: Bangalore, Pune, Ahmedabad, and Surat, are also served by the network. Then Prime Minister Atal Bihari Vajpayee laid the foundation stone for the project on January 6, 1999. The largest highway project in India, it is the first phase of the National Highways Development Project (NHDP).