Urban codes have a profound influence on urban form, affecting the design and placement of buildings, streets and public spaces. Historically, their use has helped create some of our best-loved urban environments, while recent advances in coding have been a growing focus of attention, particularly in Britain and North America. However, the full potential for the role of codes has yet to be realized.

In Stephen Marshall's book - Urban Coding and Planning - the nature and scope of coding are investigated; its purposes; the types of environments it creates; and, perhaps more importantly, its relation to urban planning.

The purpose of this question is to bring this discussion of how zoning codes affect the urban form. Can you help with something?