LECTURE 2: URBAN STRUCTURE AND INFRASTRUCTURE
Many older cities appear to be jumbled together, seemingly without a structural plan. This quality is a legacy of earlier unplanned or organic development, and is often perceived by today's tourists to be picturesque. In contrast, cities founded after the advent of the automobile and planned accordingly tend to have expansive boulevards impractical to navigate on foot.
Modern city planning has seen many different schemes for how a city should look. The most commonly seen pattern is the grid, favoured by the Romans, almost a rule in parts of the New World, and used for thousands of years in China. Derry was the first ever planned city in Ireland, begun in 1613, with the walls being completed five years later. The central diamond within a walled city with four gates was thought to be a good design for defence. The grid pattern chosen was widely copied in the colonies of British North America. However, the grid has been around for far longer than the British Empire. The Ancient Greeks often gave their colonies around the Mediterranean a grid plan. One of the best examples is the city of Priene. This city even had its different districts, much like modern city planning today. Fifteen centuries earlier the Indus Valley Civilization was using grids in such cities as Mohenjo-Daro. Grid plans were popular among planners in the 19th century; such plans were typical in the American West, in places such as Salt Lake City and San Francisco. Also in Medieval times we see a preference for linear planning. Good examples are the cities established in the south of France by various rulers and city expansions in old Dutch and Flemish cities.
Other forms may include a radial structure in which main roads converge on a central point, often the effect of successive growth over long time with concentric traces of town walls and citadels - recently supplemented by ring-roads that take traffic around the edge of a town. Many Dutch cities are structured this way: a central square surrounded by concentric canals. Every city expansion would imply a new circle (canals + town walls). In cities like Amsterdam and Haarlem, and elsewhere, such as in Moscow, this pattern is still clearly visible.
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