After just 50 years the original Forth Road Bridge is falling apart. The bridge was given an expected lifespan of 120 years when it opened in 1964, but that was calculated under the assumption that the roadway would be carrying just half the traffic that it actually does today.
So a new bridge is being built, called the Queensferry Crossing.
The third bridge in the photo - the one at the back - is the Forth Bridge, which is a rail bridge, and has been there pretty much trouble free for about 130 years. They don’t make them like that any more.