Fact 🧞‍♂️

🧞‍♂️ SpotGenie Fact: India’s Longest Road Tunnel by Pure Length

Stretching ~9.28 km, the Dr. Syama Prasad Mookerjee Tunnel (Chenani-Nashri) is India’s longest road tunnel in terms of sheer length. Opened in April 2017, it bypasses snow-prone mountain roads and reduces travel time between Jammu & Srinagar by about 2 hours.

Pratik Kamble

01 Oct 2025 — 1 min read

India’s Longest Road Tunnel

🛠️ Key Details & Validated Info

Feature	Syama Prasad Mookerjee Tunnel (Chenani-Nashri)
Length	~ 9.28 km (9.2-9.34 km depending on source)
Location	Jammu & Kashmir, on NH-44, between Chenani and Nashri, near Patnitop
Opened	2 April 2017
Altitude	~ 1,200 meters above sea level
Lanes / Road Type	Two lanes; automotive traffic; bypasses sections prone to snow / landslide / avalanche
Safety / Features	Fully integrated tunnel control system; main tunnel + safety/escape tunnel; cross-passages every ~300 m; ventilation & emergency systems.

🔍 Comparison: Syama Prasad Mookerjee vs Atal Tunnel

Tunnel	Length	Altitude / Other Notable Points
Syama Prasad Mookerjee (Chenani-Nashri)	~9.28 km, slightly longer in raw length than Atal.
Atal Tunnel	9.02 km	Sits at higher altitude (~3,000-3,100 m), under Rohtang Pass; first tunnel in India above 10,000 feet with an escape tunnel inside the main tube; greater strategic value due to weather-cut-off risk.

So, Syama Prasad Mookerjee Tunnel holds the record for the longest road tunnel by length in India, while Atal Tunnel holds a different record (longest highway tunnel above 10,000 ft etc.).

⚙️ Why Syama Prasad Mookerjee Tunnel is Important

Provides all-weather connectivity on NH-44, bypassing multiple snow/landslide risk zones which winter-block the older winding pass roads.
Cuts travel time between Jammu & Srinagar by ~ 2 hours, reduces the distance by ~30 km.
Enhances safety with built-in ventilation, safety tunnel and cross-passages, monitoring systems to handle emergencies.

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