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India, with its vast geography and diverse terrain, relies heavily on its national highways (NHs) for connectivity, trade, and travel. Stretching thousands of kilometers, these highways link cities, towns, ports, and industrial hubs across the country. But have you ever wondered which highways are the longest in India and what makes them significant? In this guide, we provide a complete list of the longest national highways in India, along with their key details, routes, and importance. What Are National Highways in India? National Highways are the primary roadways maintained by the Government of India through the Ministry of Road Transport & Highways (MoRTH). These highways ensure smooth interstate connectivity, facilitate trade, and serve as lifelines for the economy. Key points about National Highways: Total Length: Over 1,50,000 km as of 2025. Numbering System: NHs are numbered systematically based on direction and region. Even numbers: Eas...