The Millau Viaduct Connects two limestone plateaus (the Causse du Larzac and the Causse Rouge), crossing above the Tarn valley below, which is taken by small winding country roads around the town of Millau. being heavily congested during holiday periods as it was the only way to cross the valley. The bridge is located in the communes of Millau and Creissels, in the south of France. The Millau viaduct is the last link of the A75 motorway, a motorway which extends from Clermont-Ferrand to Pézenas. It is a large, continuous highway where cars can travel at speeds above the normal speed limit, and which is long and straight, allowing cars to cross France directly and quickly. The Millau Viaduct is the highest suspension bridge in the world, with its tallest pylon measuring 343 m in height and its total weight being 242,000 tonnes. The road itself is 2.46 km long and is 280 m above the valley floor. The weight of the road deck amounts to 36,000 tonnes. The steel road deck, 4.2 m thick, is 32 m wide, wide enough for two lanes of traffic in each direction. The total quantity of concrete used for the structure was 205,000 tonnes. One of the great technical feats during the construction of this bridge was the use of steel. Despite its maximum height of 343 m and span of 2.46 km, at 280 m above the valley floor, the bridge is actually quite light. 242,000 tons sounds like a lot, but without the use of structural steel, this bridge would have been more than twice as heavy. Steel is a much stronger material than concrete, so it can support more weight with less mass. The road deck itself, made almost entirely of steel, weighs only 36,000 tonnes. The remaining 206,000 tonnes mainly come from the massive pylons, which are on average paper ...... were reduced and the bridge was ensured a longer lifespan. The Hampden Bridge was built to replace the Wagga Bridge. Wagga Company Bridge, a toll bridge built in 1862. Hampden Bridge was built as it would provide the main and one of the only links between North Wagga Wagga South Wagga Wagga, which were divided by the Murrumbidgie River. The Hampden Bridge was a great benefit to the Wagga-Wagga community as it provided quick and easy access over the Murrumbidgie River to cross from north to south Wagga Wagga. Some of the disadvantages of the bridge were that after 100 years of use, in 1975 the bridge started to collapse and eventually after a few years the cost of maintaining the structure started to become too high, so the board of Wagga Wagga has closed the bridge, and there are currently plans in place to demolish the bridge in the future..