The southern bench of NGT had recently restrained the BDA from proceeding with the project for four weeks and posted the matter to November 25 for further hearing.
The tribunal had granted interim stay on petitions from Neelaiah, Citizen Action Forum and others, which opposed the project on environmental grounds.
The Rs 1,761-crore project of BDA is to construct a 6.72- km-long, six-lane steel flyover between Basaveshwara Circle andHebbal to decongest traffic, but it has run into rough weather as it involved felling of an estimated over 800 trees.
NBF also claimed that the tender for the project was called in March, but a public consultation was held only in June.
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As protests mounted against the project, Bengaluru Development Minister K J George had dismissed it as a 'political gimmick' and said the government had taken the decision after consultations with experts and due diligence.
Karnataka Chief Minister Siddaramaiah had defended the proposed construction of the steel flyover, calling it "totallytransparent" and claimed the project was proposed in 2010 andannounced in the 2014-15 budget.