Traffic generated by mixed-use developments—A follow-up 31-region study |
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Institution: | 1. Department of Planning and Urban Studies, University of New Orleans, United States;2. Department of Landscape Architecture and Environmental Planning, Utah State University, United States;3. Department of City and Metropolitan Planning, University of Utah, United States;4. Fehr & Peers, Walnut Creek, CA, United States |
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Abstract: | This study aims to improve a previously-developed methodology for predicting the traffic impacts of mixed-use developments (MXDs). In 31 diverse metropolitan regions across the United States, we collected consistent regional household travel survey data and computed built environment characteristics—D variables—of MXDs. Multilevel modeling (MLM) was employed to predict the probability of trips captured internally within MXDs, walking on internal trips, and travel mode choice on external trips, by trip purpose. Larger, denser, mixed-use, and more walkable MXDs show a larger share of trips internally, compared with conventional suburban developments. Those MXDs with good access to transit, employment, and destinations also show higher levels of walking, biking, and transit shares on external trips, thus helping to reduce traffic impacts on the external road network. Perhaps the most impressive finding is that well-designed MXDs have walk shares of more than 50 percent on internal trips. A k-fold cross-validation supports the robustness of our analyses. |
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Keywords: | Trip generation Built environment Mixed-use development Internal capture Mode choice Multi-modal transportation |
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