Forth Amendment  Stuart Nathan  A unique cable-stayed bridge
looks set to enhance Scotland’s structural landscape while
maintaining vital transport links.  Head north out of Edinburgh
on the A90 and you’ll soon be treated to one of the British
Isles’ most iconic views, and one guaranteed to quicken the
pulse of any engineering enthusiast: the Firth of Forth. To your
right, the rust-red repeating stretched hexagons of the Forth
Bridge, sometimes called Scotland’s equivalent of the Eiffel
Tower and one of the most famous examples of Victorian
engineering, still carrying trains between Lothian and Fife 122
years after it opened. To the left, the soaring towers of the
Forth Road Bridge, in its day the longest suspension bridge
outside the US, supporting more than a kilometre of roadway on
which 65,000 vehicles travel every day.  But within a few years,
the view will be very different, with a third bridge adding to
the vista. The Forth Replacement Crossing, for which works are
now under way, will span the estuary