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"Replacing the Hammersmith Flyover with a tunnel could take just three years and in theory might be self financing by releasing around £1bn worth of former highway land, according to the local council's latest study.
"Hammersmith and Fulham LBC’s ‘flyunder’ feasibility study - developed in partnership with Halcrow engineers - has produced three possible options for replacing the elevated section of the A4. The plans vary from being 1 mile to 2.5 miles long and costing between £218m and £1.7bn.
"The council has long been campaigning to replace the aging structure, with the calls increasing in volume in recent years due to the flyover being plagued by lane closures since the Christmas of 2011 when structural weaknesses caused by water damage necessitated major repair works."