Existing literature suggests that mixed land-use developments have the potential to reduce traffic by “capturing” some trips internally and providing a pedestrian-friendly environment to facilitate walking for some trips. However, these elements which are meant to provide the traffic-reducing benefits also reduce the overall cost of travel, thereby increasing the total amount of travel. This “induced” travel has implications for the site planning process, which assumes that all internal trips are replacing trips on the external street network. In this investigation, travel survey data were analyzed to determine the nature and extent of induced travel at mixed-use developments. The study site was a 75-acre suburban infill mixed-use development in Plano, Texas. Features of the study site included a diverse land-use mix, a grid-style street layout, and pedestrian-oriented streetscapes. The travel survey was administered as an interview of persons exiting buildings at the site and gathered information about two trips made by the respondent, including whether the trip made at the time of the interview was induced. A trip was considered induced if the respondent would not have made the trip if it had required travel outside of Legacy Town Center. Analysis found that in the morning, four percent of all trips at the study site were induced; in the afternoon, about one-quarter of all trips were induced. Induced trips accounted for one-eighth of internal trips in the morning and forty percent of internal trips in the afternoon. Most internal trips made in an automobile were replacements for off-site travel while most trips made on foot were induced. Based on this study, it is evident that some internal trips at mixeduse developments are not “captured” from external streets, but represent additional trips, induced by travel cost savings in the mixed-use environment. However, it is demonstrated that, even with this additional travel, mixed-use developments still contribute to a reduction in overall vehicle-miles of travel. Stakeholders are encouraged to consider these findings when evaluating new land-use policies or the traffic impacts of proposed mixed-use developments.

This thesis studies New Urbanism, a movement intending to address the problems of the American suburbs and create pleasing and livable communities. The focus is on the Traditional Neighborhood Design concept (TND), one of the five types of New Urbanism developed in the late 1980's by architects Andre Duany and Elizabeth Plater-Zyberk. The goal of this thesis is to develop the best community design concept, with a basis in the TND concept, which responds to local cultural and physical environments. The study is comprised of two approaches: a literature review and a design approach. In the first three chapters, the findings of the literature review are shown. There include (1) the history, structure, and problems of the American suburbs, (2) the theory and types of New Urbanism community structures, and (3) the characteristics of TNDs. At the end of Chapter 3 the TND concept is analyzed using four criteria comprised, uses and activities, public space, circulation and typological characteristics of architecture, as well as a summary of the strengths and weaknesses of the TND concept are summarized. In Chapter 4 the development of a TND plan for the New Town of Williamsburg is shown, which includes the context of the site, history of Colonial Williamsburg, site inventory, site analysis, design concept, and design development. The design concept was developed from the findings of the site analysis and the improved TND concept. The conclusions in Chapter 5 provide an overview of this thesis, findings of both the research and design part, lessons from this thesis, and areas for future research / Master of Landscape Architecture

This study examines the LEED-ND pilot rating program created by the United States Green Building Council (USGBC), the Congress for New Urbanism, and the Natural Resources Defense Council (NRDC) in 2007. The rating system is evaluated based on its application as a broad set of national standards meant to encourage green neighborhood development. The main case study is a master planned community in semi-rural Paso Robles, California. Among other things, the study discovers problems related to the application of the rating system in semi-rural and rural regions of the Western United States. Both the standards used by the rating system and the certification process itself were considered through a case study methodology.