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The research goal of this project was to explore heterogeneity in how much Californians will change the amount that they drive in response to changes in land use and transport system characteristics. We explore heterogeneity across two important dimensions \u2013 neighborhood type and trip type \u2013 and use statistical analysis of travel survey and land use data to quantify these relationships. We control for key household and individual demographic characteristics and characteristics of the surveys themselves. We also control for household selection of residential neighborhood type. <\/SPAN><\/P>

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This project used data from numerous sources and required the use of multiple statistical methods to estimate the effect of land use and transport system variables on VMT, differentiated by local context. To create the dataset, we merged observations from five household travel surveys conducted in California between 2000 and 2009, calculated the distance for each trip taken in a vehicle, and added variables to represent the built environment in the census tract where each household lived. These variables were derived from census data as well as calculated using GIS and MapQuest\u2019s Application Programming Interface (API). <\/SPAN><\/P>

<\/P>

Our final household estimation sample included complete observations for 52,975 weekday travel diaries from 45,624 households, some of which reported their travel on two days. This sample is much larger than any that we are aware of in the related existing literature. Our large sample is important because it allows us to obtain robust estimates of the effects we are interested in for each of seven distinct neighborhood types. <\/SPAN><\/P>

<\/P>

Our main analysis consisted of three steps. First, we used quantitative methods to classify census tracts into seven neighborhood types. Second, we estimated a multinomial logit model (MNL) of household choice of which neighborhood type to live in. Finally, we estimated tobit models of household weekday VMT, commute VMT for adult workers, and nonwork VMT for all adults for each neighborhood type. The tobit analyses are linked to the MNL model of neighborhood type choice as a means to control for residential self-selection. Tobit models are similar to linear regression analysis techniques, but more appropriately account for the significant percentage of zero VMT observations in our data. These models are the basis for calculation of the marginal effects and elasticities that are the main results of this project. <\/SPAN><\/P>

<\/P>

<\/P>

Results <\/SPAN><\/P>

<\/P>

The contribution of this work is to estimate both average VMT and the effects of land use and transport system characteristics on VMT for different types of neighborhoods and for different types of trips. At the most basic level, we find that there are surprisingly large differences in average VMT across neighborhood types: the highest-VMT neighborhood type has three times the average VMT as the lowest. <\/SPAN><\/P>

<\/P>

We also find that the effects of some land use and transport system characteristics do depend on neighborhood type, in ways that are intuitive but had not previously been empirically verified. For instance, the effect of a change in gasoline price on VMT is effectively zero in both \u201cCentral City\u201d and \u201cRural\u201d neighborhoods. This likely reflects the fact that residents who drive in these neighborhoods do not have flexibility to choose to drive less when gas prices are high \u2013 they are already minimizing the amount that they drive. In all other neighborhood types, the VMT effect of pricing is uniformly large and statistically significant. The effect on VMT of improving job access is highly variable across neighborhood types, with the largest absolute effect of local jobs seen in the \u201cRural\u201d and \u201cSuburb, Single Family Homes\u201d neighborhood types. As would be expected, changing road density is an important determinant of VMT only in neighborhoods with relatively lower road densities. Understanding the differences in effectiveness of policies on VMT will help to prioritize local actions to reduce VMT to comply with AB 32 and SB 375. <\/SPAN><\/P>

<\/P>

A rough scenario analysis indicates that marginal infrastructure changes within neighborhood types will yield reductions in VMT and greenhouse gas emissions on the order of 5 percent. <\/SPAN><\/P>

<\/P>

Conclusions <\/SPAN><\/P>

<\/P>

This research has shown clearly that there is considerable heterogeneity in both Californians\u2019 VMT and their estimated VMT response to changes in land use and transport system characteristics. These differences can be explained by categorizing neighborhoods. Looking forward, we suggest that studies of current policy \u201cnatural\u201d experiments with before-after data collection be conducted, as these would provide a more direct link between on-the-ground actions and their VMT results. <\/SPAN><\/P>

<\/P>

<\/P>

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SANDAG uses a Master Geographic Reference File system for storing demographic, economic, and other information. The geographic units in this system (master geographic reference areas, or MGRAs) are very small, defined by census blocks and in some cases sub-block areas. Sub-block areas are formed by overlaying block boundaries to those of other geographic areas such as spheres of influence and community planning areas. 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This dataset comprises polygons of census tracts for San Diego County. A census tract is a geographic region defined for the purpose of taking a census. Usually these coincide with the limits of cities, towns or other administrative areas and several tracts commonly exist within a county. In unincorporated areas, these are often arbitrary, except for coinciding with political lines. Census tracts are subdivided into block groups and census blocks.<\/SPAN><\/P>

The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Census Blocks are statistical areas bounded on all sides by visible features, such as streets, roads, streams, and railroad tracks, and/or by nonvisible boundaries such as city, town, township, and county limits, and short line-of-sight extensions of streets and roads. Census blocks are relatively small in area; for example, a block in a city bounded by streets. However, census blocks in remote areas are often large and irregular and may even be many square miles in area. A common misunderstanding is that data users think census blocks are used geographically to build all other census geographic areas, rather all other census geographic areas are updated and then used as the primary constraints, along with roads and water features, to delineate the tabulation blocks. As a result, all 2010 Census blocks nest within every other 2010 Census geographic area, so that Census Bureau statistical data can be tabulated at the block level and aggregated up to the appropriate geographic areas. Census blocks cover all territory in the United States, Puerto Rico, and the Island Areas (American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands). Blocks are the smallest geographic areas for which the Census Bureau publishes data from the decennial census. A block may consist of one or more faces.<\/SPAN><\/P>

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Mobility Choices aims to provide more mobility options for San Diegans to commute and recreate by streamlining development in areas of the City that are most aligned with the City\u2019s climate goals and by investing in active transportation infrastructure, such as pedestrian and bicycle facilities. These investments are focused in Communities of Concern, where the need is the greatest. Regulations for Complete Communities: Mobility Choices can be found in the San Diego Municipal Code Chapter 14, Article 3, Division 11.<\/SPAN><\/P>

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