At 1.6 miles 2.7km, the Queensferry Crossing is the longest bridge of its type in the world and, at 210m 689ft high, Britain’s tallest.The Queensferry Crossing is a road bridge in Scotland. Built next to the Forth Road Bridge, it leads the M90 ​​motorway across the Firth of Forth between South Queensferry in Lothian and North Queensferry in Fife.