India, Dec. 11 -- New Delhi

A key hurdle to Delhi's first double-decker viaduct-a flyover with a Metro line on top-was cleared last week, with the Delhi Metro Rail Corporation (DMRC) receiving permission to fell and transplant multiple trees, which were preventing the construction of the flyover's ramp, officials aware of the matter said.

The viaduct, which is 1.4 kilometres long, is being built between the Bhajanpura and Yamuna Vihar Metro stations, as part of the Pink Line corridor extension from Maujpur to Majlis Park, but work was stuck for over two years as the Delhi Metro Rail Corporation (DMRC) required permission to fell trees to complete construction.

While the DMRC is building three such double-decker viaducts, this is expect...