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| National Highway 5 | |
|---|---|
| Country | India |
| Type | NH |
| Length km | xxxxx |
| Direction a | North |
| Terminus a | Siliguri |
| Direction b | South |
| Terminus b | Nagaon |
| States | West Bengal, Assam |
National Highway 5 is a primary arterial roadway traversing northeastern India, linking the Siliguri region in West Bengal with the central plains of Assam around Nagaon. The route connects major urban centers, river crossings, rail junctions and strategic corridors, intersecting with other highways serving Guwahati, Dhubri, Tezpur and regional trade nodes. It supports passenger transport, freight movements and links to transnational corridors toward Bangladesh, Bhutan and the Northeast Frontier Railway network.
The alignment begins near Siliguri adjacent to the Bagdogra Airport and moves eastward toward Alipurduar and Cooch Behar, skirting the Mahananda River and crossing feeder roads to Jalpaiguri and Kishanganj. Entering Assam, the highway passes Kokrajhar and Goalpara before crossing the Brahmaputra River via approaches that tie into ferry points and bridges serving Guwahati and Nagaon. Along its length it intersects state highways serving Darjeeling, Gangtok, Barpeta and industrial towns linked to Numaligarh Refinery Limited, Brahmaputra Valley Fertilizer Corporation and regional markets such as Sonitpur and Morigaon. Major rail interfaces include junctions with the New Jalpaiguri and Katihar nodes of the Indian Railways.
The corridor traces origins to colonial-era cart tracks and the Silk Road-era links between the Bengal plains and the Himalayan foothills. Upgrades under post-independence national road plans occurred during the Five-Year Plans and later under the Pradhan Mantri Gram Sadak Yojana and national highway rationalizations initiated by the Ministry of Road Transport and Highways. Strategic improvements accelerated after regional events such as the 1971 Bangladesh Liberation War and border adjustments that emphasized connectivity to Bhutan and the Northeast Frontier region. Recent policy reforms under the Bharatiya Janata Party-led central governments prioritized expansion to support projects linked to the Look East Policy and the Act East Policy.
The highway intersects numerous national and state routes, including junctions near Siliguri with corridors to Kolkata and Patna, a cross with the east–west link serving Darjeeling and Gangtok, and interchanges close to Guwahati that tie into routes toward Tezpur, Jorhat, Dibrugarh and Dimapur. Other critical nodes include access roads to Bagdogra Airport, connectors to the Bogibeel Bridge axis, and linkages with corridors serving Numaligarh and Bongaigaon. These intersections integrate with logistics hubs, rail terminals such as New Jalpaiguri and river ports on the Brahmaputra.
Traffic volumes vary seasonally, with increases during festivals linked to Durga Puja, Bihu, Diwali and tourist flows to Darjeeling and Kaziranga National Park. Freight traffic includes petroleum and petrochemical movements to Numaligarh Refinery Limited and agricultural produce from Assam and West Bengal grain belts. Toll plazas administered through concessionaires awarded by the Ministry of Road Transport and Highways and public-private partnerships collect fees at strategic points near Alipurduar and Goalpara, using electronic toll collection compatible with national FASTag mandates enforced by the National Payments Corporation of India.
The route underpins trade between the Brahmaputra valley and the Bengal plains, facilitating linkages for tea estates in Assam Tea Board areas, forest-product flows from Dooars and tourist access to Kaziranga National Park and Manas National Park. Industrial zones at Bongaigaon and refinery-linked towns benefit from reduced transit times to export outlets via Kolkata Port and inland riverine transshipment points. Improved connectivity has influenced investments by entities including state industrial development corporations, agro-processing firms and logistics companies operating in Northeast India and has supported labor mobility to urban centers such as Guwahati and Siliguri.
Phased upgrades have included pavement rehabilitation, widening to two or four lanes, construction of bypasses around urban centers like Cooch Behar and grade-separated interchanges near major junctions. Projects have been financed via central budget allocations, multilateral assistance and contracts awarded to construction firms involved in national infrastructure programs. Notable engineering works include river-crossing structures designed to withstand monsoon-induced scour on the Brahmaputra and slope stabilization in sections adjacent to the Himalayan foothills, employing technologies promoted by agencies such as the Central Road Research Institute.
Safety challenges on the corridor reflect seasonal flooding, fog in winter months affecting visibility near Siliguri and wildlife crossings in protected areas like Jaldapara National Park and Manas National Park. Recorded incidents have included multi-vehicle collisions on foggy stretches, bridge-related disruptions during high flows of the Brahmaputra, and isolated landslides in hill-adjacent reaches. Countermeasures implemented involve improved signage, speed regulation near towns, deployment of traffic police in coordination with state transport departments, and wildlife mitigation measures developed with conservation bodies such as the Wildlife Institute of India and the Ministry of Environment, Forest and Climate Change.