Longest Roads, Highways and Expressways in India

India possesses the second-largest road network globally, spanning over 63 lakh kilometers. This network is stratified into National Highways (NH), Expressways, State Highways (SH), and rural roads. For UPSC Civil Services aspirants, understanding the spatial distribution, corridors, economic nodes, and engineering feats of India’s arterial roadways is essential for questions on physical geography, economic infrastructure, and regional connectivity.

National Highways: Grid Connectivity and Spatial Extremes

Longest Continuous National Highway: NH-44

• Route Extension: Spans a total length of 4,112 kilometers along India’s North-South transport axis.
• Geographical Corridor: Begins at Srinagar in Jammu and Kashmir and terminates at Kanyakumari in Tamil Nadu.
• Territorial Coverage: Traverses 11 states and Union Territories, including Jammu and Kashmir, Punjab, Haryana, Delhi, Uttar Pradesh, Madhya Pradesh, Maharashtra, Telangana, Andhra Pradesh, Karnataka, and Tamil Nadu.
• Administrative Context: Formed by merging seven major historical national highways: NH-1A, NH-1, NH-2, NH-3, NH-75, NH-26, and NH-7.

Second Longest National Highway: NH-27

• Route Extension: Covers a total geographic distance of 3,507 kilometers.
• Geographical Corridor: Forms the foundational spine of India’s East-West transport axis, connecting Porbandar in Gujarat to Silchar in Assam.
• Territorial Coverage: Passes through seven states: Gujarat, Rajasthan, Madhya Pradesh, Uttar Pradesh, Bihar, West Bengal, and Assam.

Longest Highway Along the East Coast: NH-16

• Route Extension: Spans a total length of 1,711 kilometers.
• Geographical Corridor: Runs parallel to the Bay of Bengal coastline, connecting Kolkata in West Bengal to Chennai in Tamil Nadu.
• Territorial Coverage: Traverses West Bengal, Odisha, Andhra Pradesh, and Tamil Nadu, acting as a crucial maritime logistics corridor.

Smallest National Highway: NH-966B (formerly 47A)

• Route Extension: Spans a nominal distance of just 6 kilometers.
• Geographical Corridor: Located entirely within the state of Kerala, connecting Kundannoor to Willingdon Island in Kochi.

Access-Controlled Expressways: High-Speed Logistics

Longest Greenfield Expressway Corridor: Delhi–Mumbai Expressway (NE-4)

• Network Scale: Spans an ultimate planned length of 1,386 kilometers, significantly reducing travel time between India’s political and financial capitals to 12 hours.
• Geographical Route: Traverses Delhi, Haryana, Rajasthan, Madhya Pradesh, Gujarat, and Maharashtra.
• Engineering Standard: Developed as an 8-lane access-controlled greenfield corridor, expandable to 12 lanes. It features India’s first dedicated wildlife overpasses and underpasses based on the European model to ensure unhindered animal movement across the Aravalli and Ranthambore eco-sensitive zones.

Longest Intra-State Operational Expressway: Purvanchal Expressway

• Network Scale: Spans a total length of 340.8 kilometers.
• Geographical Route: Located entirely within Uttar Pradesh, connecting Karwal Kheri in Lucknow district to Hydaria in Ghazipur district.
• Strategic Utility: Features a 3.2-kilometer long dedicated airstrip at Kurebhar in Sultanpur district to facilitate emergency landings for Indian Air Force (IAF) fighter jets.

Longest Operational Inter-State Expressway: Trans-Haryana Expressway (NH-152D)

• Network Scale: Spans a continuous length of 227 kilometers.
• Geographical Route: Connects Gangheri in Kurukshetra district to Surani in Mahendragarh district near the Rajasthan border.
• Strategic Utility: Acts as a bypass for traffic moving between North India and Western/Southern India, reducing congestion in the National Capital Region (NCR).

Widest Urban Expressway Footprint: Dwarka Expressway

• Network Scale: Spans a total route length of 29 kilometers, with 18.9 kilometers in Haryana and 10.1 kilometers in Delhi.
• Engineering Standard: Features India’s first 16-lane access-controlled configuration. It includes massive multi-level stack interchanges, a 3.6-kilometer long 8-lane urban tunnel box, and is built as an elevated urban corridor on a single pier structure.

Mega Highway Connectivity Initiatives

Golden Quadrilateral (GQ)

• Total Length: 5,846 kilometers.
• Geographical Scope: Connects the four major metropolitan macro-nodes of India: Delhi (North), Mumbai (West), Chennai (South), and Kolkata (East).
• Administrative Context: Managed entirely by the National Highway Authority of India (NHAI).

North-South and East-West Corridor (NS-EW)

• Total Length: Approximately 7,300 kilometers.
• Geographical Scope: The North-South corridor links Srinagar to Kanyakumari (coinciding heavily with NH-44), while the East-West corridor links Porbandar to Silchar (coinciding with NH-27).
• Intersection Node: The two massive corridors intersect at Jhansi in Madhya Pradesh/Uttar Pradesh border region.

Reference Matrix of Major Indian Highways and Expressways

Civil Services Fact File and Trivia

The New Highway Numbering System

The Ministry of Road Transport and Highways (MoRTH) uses a systematic grid system for numbering national highways. All East-West oriented highways are assigned odd numbers (increasing sequentially from North to South, e.g., NH-1 to NH-85). All North-South oriented highways are assigned even numbers (increasing sequentially from East to West, e.g., NH-2 to NH-68).

India’s First “Solar Expressway”

The Bundelkhand Expressway in Uttar Pradesh is designated as India’s first “Solar Expressway.” Utility-scale solar panels are installed along the right-of-way (RoW) clear zones and median tracks, generating solar energy to power adjacent charging grids, streetlights, and nearby villages.

Asia’s Longest Elevated Wildlife Corridor

The newly developed Delhi–Dehradun Economic Corridor incorporates a 12-kilometer continuous elevated wildlife corridor running through the Rajaji National Park. This infrastructure prevents vehicular animal-strikes on elephants, leopards, and tigers while allowing traffic to bypass the eco-sensitive zone.

The “Intelligent Transport System” (ITS)

Modern corridors like the Eastern Peripheral Expressway (NE-2) and the Mumbai-Pune Expressway utilize an automated Intelligent Transport System. This technology integrates weight-in-motion sensors, variable message signs, speed-enforcement cameras, and incident detection systems to manage traffic flows and reduce human error.