The bridge, built in 1964, spans the Firth of Forth, connecting the capital city Edinburgh at South Queensferry to Fife at North Queensferry. The toll bridge replaced a centuries-old ferry service to carry vehicular traffic, cyclists, and pedestrians across the Forth; rail crossings are made by the adjacent and historic Forth Bridge. Mott, Hay and Anderson and Freeman Fox & Partners designed and constructed the bridge at a cost of £11.5 million, while the total cost of the project including road connections and realignments was £19.5 million. It was the longest suspension bridge outside the United States and the fourth-largest in the world at the time of its construction. The bridge's central main span is 1006 m (3298 ft) long, its two side spans are each 408 m (1338 ft) long, and the approach viaducts are 252 m (827 ft) on the north side and 438 m (1437 ft) on the south side; at a total length of 2512 m (8242 ft).