The earliest bridges were based on anything seen in nature such as fallen trees and eroded earth or rocks. They were developed to provide a safe crossing for people, originally on foot but later on horse back and then mechanized transportation, to travel from one prominent city of industrial strength to another. Although for many centuries boats were still the main form of transportation over distances of water. In Henry Petroski’s book, Engineers of Dreams, he discusses significance of bridges and bridge engineering in history by connecting then back to the Stone Age and analyzing the impact they have had on society.
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