Modern city planning started with the Industrial Revolution and the scientific advances of the ��19th Century. At the time, Catalan engineer Idelfons Cerdà coined the word "urbanism” as a new and necessary science to deal with cities, having three major preoccupations:� hygiene, traffic, and equality. In this article, Judith Urbano discusses Cerda's plan for the expansion of Barcelona and why it is considered an icon of modern planning�

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