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Jane Jacobs's The Death and Life of Great American Cities (1961) had an enormous influence on urban design theories and practices. This study aims to operationalize Jacobs's conditions for a vital urban life. These are (1) mixed use, (2) small blocks, (3) aged buildings, and (4) a sufficient concentration of buildings. Jacobs suggested that a vital urban life could be sustained by an urban realm that promotes pedestrian activity for various purposes at various times. Employing multilevel binomial models, we empirically verified that Jacobs's conditions for urban diversity play a significant role with regard to pedestrian activity.

Since 1962 virtually every Danish town has converted its major downtown shopping street into a pedestrian thoroughfare known as a gSgade (walking streeO. The g~gader have been successful at relieving traffic congestion; stabilizing inner city retail sales," encouraging the pedestrian activity of women, children, and the elderly; and increasing public appreciation of the historic urban architecture of the pre-automobile age. Supporters of the pedestrian concept are eager to expand the g~gader to residential areas outside the inner city commercial core, but rising opposition from motorists, as well as practical limitations, have hindered a further transfer of street space from automobile to pedestrian use.

In the 1970s, the Dutch city of Delft adopted a new residential street layout. Its fundamental concept was the antithesis of the notion of segregating pedestrians and vehicles. It emphasized integration of traffic and pedestrian activity as a positive principle for street planning. The shared street approach was later systematized by local agencies and given legal status by the national government. This new concept has drawn global attention, and similar street designs are appearing not only in Europe, but also in Japan, Australia, and Israel. The shared street concept's adaptability to different countries and societies reinforces its status as a valid, flexible choice for residential street layouts. Studies and surveys of shared streets in these countries have found considerable reductions in traffic accidents, increased social interaction and play, and a high degree of satisfaction by the residents. The available data and the successful implementation of the shared street in other countries can foster its acceptance in the United States. In particular, shared streets could be a workable alternative to the prevailing street layouts in new suburban subdivisions.

By measuring twenty streetscape features and numerous other variables for 588 blocks in New York City, we were able to identify variables that explain pedestrian traffic volumes. We found significant positive correlations between three out of twenty streetscape features with pedestrian counts after controlling for density and other built environmental variables. The significant streetscape features are the proportion of windows on the street, the proportion of active street frontage, and the number of pieces of street furniture. This study provides guidance for streetscape projects that aim to create walkable streets and pedestrian-friendly environments.

Declines in children's independent mobility are frequently attributed to parents' fears about stranger danger, yet there is limited understanding of the factors that might aggravate (or ease) these concerns. We examined the social and built environment correlates of parents': (1) fears about strangers harming their child; and (2) perceptions of the likelihood this would actually happen. We also tested whether associations differed by area socio-economic status (SES) as parents in low income neighbourhoods, typically with more crime, may hold greater fears for their children's safety. Results suggest that regardless of SES, neighbourhood features that encouraged pedestrians, whilst minimising vehicle traffic, were most conducive to parents perceiving a safer neighbourhood. The natural surveillance generated by a more walkable neighbourhood may help alleviate parents' fears about strangers.