KOLKATA: Two flyovers collapses in three years in the city and 27 killed. Lessons learnt: None.The collapse of the under-construction Vivekananda Road flyover on March 31, 2016, that killed 27 people is considered one of the city’s worst disasters.In January, IIT-Kharagpur experts tasked by the government to decide the structure’s future, recommended pulling it down.Authorities have not yet moved on the report.Ironically, when the 40m curve of the Ultandanga flyover collapsed under the weight of a goods truck in March 2013, the state government had passed the blame on the previous Left Front regime. Three years later, blame game followed the collapse of Vivekananda Road bridge, but the state government also did its bit — removing the debris in record time and assigning IIT experts to find out what led to the collapse, and then again turning to the same experts for the crucial advice on the future of the flyover.“But it has done nothing ever since the IIT report was furnished,” a government official pointed out, adding, “The government is still in the raze-or-retain dilemma, like it was at the time of the flyover collapse.”The locals are apprehensive that the structure “may collapse any time”. They are mostly residents of Burrabazar, the largest wholesale market in eastern India, who have been vocal about pulling the remaining part of the flyover down to avoid further disaster.The IIT-Kharagpur team comprised Anandapran Gupta, Sreeman Bhattacharya and Swapan Majumdar, who were also part of the fact-finding committee, headed by former chief secretary Basudeb Banerjee and formed to unearth the reasons of collapse.In August 2016, these experts submitted a report citing faulty design, poor quality of raw materials and lack of supervision as the cause of collapse of the under-construction flyover. The second time around, in May 2016, when they were asked to recommend whether the flyover should be pulled down, the experts took six months to study the depths of the structural defects. They took cognizance of a detailed project report by engineering agency CES in 2008 that had said that the flyover would not be able to accommodate traffic load beyond 2017.The IIT team surveyed whether the overpass could accommodate Howrah-bound traffic till 2040 and realized the flyover couldn’t be of any use in 2025, let alone 2040.