The correct answer is Bharatmala. Explanation & Key Takeaways: • The Golden Quadrilateral that connects the four major cities of Delhi, Mumbai, Chennai and Kolkata is part of the Bharatmala project. • The principal routes of the Indian Railways on the Golden Quadrilateral and diagonals are: • Delhi - Mumbai, Delhi - Howrah, Howrah - Chennai, Chennai - Mumbai, Delhi - Chennai, and Howrah - Mumbai) • Carrying about 58% of freight traffic and 52% of coaching traffic. • India has about 62.16 lakh kilometres of the road network, which is the second largest in the world in terms of length. • It was important to redefine road development and have a macro approach while planning an expansion of the national highways network. Related Concepts: • Bharatmala Project • Bharatmala focuses on enhanced effectiveness of already built infrastructure, multi-modal integration, bridging infrastructure gaps for seamless movement and integrating National and Economic Corridors. • There are six key features of the programme: • Economic Corridors: Integrating the economic corridors facilitates larger connectedness between economically important production and consumption centres. • Inter-corridor and Feeder routes: This would ensure first-mile and last-mile connectivity. • National Corridor Efficiency Improvement: Through this, the greater actionable goal is to undertake lane expansion and decongestion of existing National Corridors. • Border and International connectivity roads: Better border road infrastructure would ensure greater manoeuvrability, while also boosting trade with neighbouring countries. • Coastal and Port connectivity roads: Port-led economic development is further boosted through connectivity to coastal areas, encouraging both tourism and industrial development. • Green-field Expressways: Expressways have higher traffic configuration and choke points would benefit from green-field expressways. • Sagarmala Project • The Sagarmala programme is the flagship programme of the Ministry of Shipping to promote port-led development in the country through harnessing India’s 7,500 km long coastline, 14,500 km of potentially navigable waterways and strategic location on key international maritime trade routes. • The main vision of the Sagarmala Programme is to reduce logistics costs for EXIM and domestic trade with minimal infrastructure investment. • Sagarmala Programme was approved by the Union Cabinet in March 2015 and a National Perspective Plan was prepared by the Ministry of Shipping which was released on 14th April 2016.