The first, a railway bridge, was completed in 1890 and is called, sensibly, The Forth Bridge. You can see it on the right in the picture above.
The second, a road bridge, was completed in 1964 and is called, equally sensibly, the Forth Road Bridge. This bridge, in the centre of the picture, is beginning to show signs of wear due to the enormous increase of traffic using it.
A new project is under way to build another bridge. This will carry cars and heavier vehicles, while the 1964 bridge will be reserved for bicycles, public transport and pedestrians. The new bridge, of which you can see an artist’s impression on the left in the picture, is currently called The Forth Replacement Crossing. However, a permanent name for it will be chosen by a public vote in 2013. The bridge is due to be completed in 2016.
Oh, what an opportunity! Please let it be called The Third Forth Bridge.
Photo credit: Transport Scotland. Used under this licence.