National Highways (NH) length is a key metric in assessing the development and connectivity of a country’s road infrastructure. National Highways are the backbone of a nation’s transport system, facilitating inter-state travel, trade, and economic integration.  In India, the total length of National Highways has seen significant growth over the years, reflecting increased investments in infrastructure under programs like the Bharatmala Pariyojana. As of 2024, India boasts around 145,000 kilometres of National Highways, constituting about 2% of the total road network but handling more than 40% of total traffic. These highways are classified into primary corridors (connecting major cities), secondary corridors, and border roads. Efforts to enhance the length and quality of NHs focus on four-laning, expressway development, and widening projects. A robust highway network promotes regional integration, reduces travel time, and fosters economic development, highlighting its pivotal role in national growth strategies.