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USA Similar to many bridges which have now been constructed , the Lake Pontchartrain Causeway was an idea that originated in the early 19th century , due to the continuous use of ferry services within Louisiana , which began to come into fruition in the 20th century .

Encompassing 23.9 miles , the southbound bridges officially opened in 1956 ; however , the second round of construction works did not complete until 1969 , with an overall cost of $ 76 million . Although the bridge amassed approximately 50,000 vehicles per annum upon its original opening , around 12 million commuters access the bridge per year .

Constructed with over 9,000 concrete pilings , the toll bridge has reduced time travelled between New Orleans and the New Orleans metropolitan area , and has become a National Historic Civil Engineering Landmark .

26 March 2017