World's longest bridge planned in California

The transcript discusses major bridges, starting with the Forth Bridge in Scotland, known as the world's longest major bridge. It then moves to the New George Washington Bridge in America, which is over a mile long. Finally, it highlights California's new span, which is 4.5 miles long, and with approaches, totals 8.5 miles.

What is the significance of the structures mentioned in the text?

What is the total length of the approaches mentioned in the text?