The National Highways Development Project is a project to upgrade, rehabilitate and widen major highways in India to a higher standard. The project was implemented in 1998. "National Highways" account for only about 2% of the total length of roads, but carry about 40% of the total traffic across the length and breadth of the country. This project is managed by the National Highways Authority of India under the Ministry of Road, Transport and Highways. The NHAI has implemented US$ 71 billion for this project, as of 2006.<!-- Deleted image removed: -->
The project is composed of the following phases:
Phase I: The Golden Quadrilateral (GQ; 5,846 km) connecting the four major cities of Delhi, Mumbai, Chennai and Kolkata. This project connecting four metro cities, would be . Total cost of the project is Rs.300 billion (US$6.8 billion), funded largely by the government’s special petroleum product tax revenues and government borrowing. As of February 2011 the project is almost complete, with of the intended having been 4 laned.