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Clarence Stein (1882-1975) was an Amnerican architect and urban planner who was profoundly influenced by the [[Garden City]] ideals of [[Ebenezer Howard]]. In 1929 Stein and Henry Wright developed a new community at [[Radburn]], [[New Jersey]], based on the then-radical principle of separation of pedestrian and vehicular traffic, with discrete networks of motor roads and pedestrian footpaths, sperated where possible at crossing points by over- and underpasses.

Clarence Stein (1882-1975) was an Amnerican architect and urban planner who was profoundly influenced by the [[Garden City]] ideals of [[Ebenezer Howard]]. In 1929 Stein and Henry Wright developed a new community at [[Radburn]], [[New Jersey]], based on the then-radical principle of separation of pedestrian and vehicular traffic, with discrete networks of motor roads and pedestrian footpaths, sperated where possible at crossing points by over- and underpasses. The 'Radburn principle', and Stein's further development of the 'superblock' in his development at Sunnyside Gardens in [[New York City]], contributed greatly to [[Clarence Perry]]'s notion of the [[neighbourhood unit]] in urban planning - in effect, a cellular development of towns as agglomerations of smaller, village-type units.

 

In the [[United Kingdom]] Stein's theories were adapted to pre-existing urban neighbourhoods by the Metropolitan Police Assistant Commissioner Sir Alker Tripp (1883-1954), who in 1942 advocated the development of a heirarchy of roads and the creation of traffic precincts - city zones where through traffic would be discouraged by the selective blocking of streets.