On the morning of February 4th this year, a propylene gas tanker overturned near the Adoshi tunnel on the Mumbai-Pune Expressway. By afternoon, both the expressway and NH-48 were paralysed. By midnight, thousands of commuters sat stranded on a mountain highway with no food, no water, and no way out. The standstill lasted 32 hours.
For anyone who regularly drives this route, it was hardly unexpected. The 19-kilometre Khandala ghat section has long been the expressway’s most perilous stretch, where six lanes of expressway traffic and four lanes of NH-48 are squeezed together through tight mountain bends, steep inclines, and terrain that becomes hazardous every monsoon. A single mishap brings everything to a standstill. It has happened before. By the time you read this, it will have happened again. What changes on May 1 is that, at last, there is an alternative way around it.
The Missing Link, as the project has been officially, almost poetically, named, is a 13.3-kilometre corridor developed by the Maharashtra State Road Development Corporation that connects Khopoli on the Mumbai side directly to Kusgaon near Lonavala, bypassing the ghat section entirely. Built by Afcons Infrastructure at a cost of ₹6,695 crore over more than a decade, it cuts travel distance by 6 kilometres and journey time by up to 30 minutes. No additional toll will be charged.
Chief Minister Devendra Fadnavis is expected to inaugurate the stretch on Maharashtra Day, with over 99 percent of construction now complete.
The project's headline feature is an 8.9-kilometre, eight-lane tunnel that passes 170 feet beneath Lonavala Lake, wide enough at 23.5 metres that MSRDC has submitted it for Guinness World Records recognition as the world's widest road tunnel. A second tunnel of 1.9 kilometres handles the approach on the Pune side. Both are equipped with ventilation systems, fire safety infrastructure, and emergency voice evacuation technology.
At the other end of the tunnel system, a 650-metre cable-stayed bridge crosses Tiger Valley at a height of over 180 metres, India's tallest road bridge of its kind. Afcons engineers built it on Sahyadri ridges so narrow that heavy machinery barely had room to operate, through fog that dropped visibility to near zero and wind gusts that exceeded 100 kmph.
Access in the first six months will be restricted to cars and buses. Heavy vehicles and hazardous cargo will continue using the existing ghat route until further safety reviews are completed. Given that light vehicles already account for roughly 70 percent of expressway traffic, authorities expect congestion relief to be felt immediately, particularly on weekends, when the Lonavala stretch routinely descends into gridlock.
There will be no toll increase. What opened in 2002 as India's first access-controlled highway was always, quietly, unfinished. Twenty-four years and ₹6,695 crore later, the expressway that connects India's financial capital to its fastest-growing neighbour is finally, completely, done.
