A bridge is a structure built to span physical obstacles without closing the way underneath such as a body of water, valley, or road, for the purpose of providing passage over the obstacle, usually something that can be detrimental to cross otherwise. There are many different designs that each serve a particular purpose and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it.
New Champlain Bridge over the St Lawrence river, Montreal, Quebec, Canada. Will accommodate cars, bicycles and a light passenger train. To be commissioned end of 2018. The old bridge will be then de-constructed
Trucks are prohibited from the Pulaski Skyway for the "safety and welfare of the public", due to its outdated design. They must use an alternate route known as U.S. Route 1/9 Truck, a series of local roads through Jersey City, Kearny and Newark that carried traffic before the Skyway was built. Pedestrians and bicycles are also banned, as the road is a freeway with no sidewalks.
Isambard Kingdom Brunel, FRS (9 April 1806 – 15 September 1859), was an English mechanical and civil engineer who built bridges and dockyards, the Great Western Railway, a series of steamships including the first propeller-driven transatlantic steamship and numerous important bridges and tunnels. His designs revolutionised public transport and modern engineering.
Though Brunel's projects were not always successful, they often contained innovative solutions to long-standing engineering problems. During his short career, Brunel achieved many engineering "firsts", including assisting in the building of the first tunnel under a navigable river and development of SS Great Britain, the first propeller-driven ocean-going iron ship, which was at the time (1843) also the largest ship ever built.