One of the basic goals of urban sustainability is to manage urban flows efficiently. Urban transportation is considered one of the aspects that largely generate environmental, social and economic impacts in cities and urban regions. With the increase of automobile dependence, the new perspective about urban transportation has to favor accessibility over mobility. Accessibility is considered one of the main goals of sustainable transportation and it is used as a good concept to develop an integrated land use–transportation planning process. According to this, this paper examines the relationship between urban form and transportation in the Tijuana–Rosarito–Tecate metropolitan region, located in the cross border space between Mexico and the Unites States of America, as a framework to implement a more integrated planning process. The research is conducted at three scales: urban, metropolitan and cross border space. The first stage of this study is developed at the urban scale (Tijuana), analyzing data at the city and district level. Linear correlation analysis was implemented to identify the relation of land use factors and automobile trips. The results in this first stage indicate at the city level that population density and distance from center have negative correlations with automobile trips; significance correlation between urban form factors evidence a segregated land use pattern in Tijuana. At the district level, negative correlations appear in other factors (job density, land use mixture and transit routes density) with no relevant significance; nevertheless, core districts appear as the ones which urban conditions favor other transportation modes. Preliminary conclusions indicate that urban conditions of core districts could be implemented in the rest of the city through new zoning and transportation strategies.
accessibility, land use–transportation interaction, metropolitan region, sustainable transportation
 Silva, C. & Pinho, P., A Methodology to Assess the Contribution of the Land Use and Transport Systems to Sustainable Urban Mobility, CITTA – Research Centre of Territory, Transport
and Environment, University of Oporto: Portugal, 2006, http://www.etcproceedings.org/paper/a-methodology-to-assess-the-contribution-of-the-land-use-and-transport-systems.
 Newman, P. & Kenworthy, J., Sustainability and Cities: Overcoming Automobile Dependence, Island Press: Washington, DC, 1999.
 Cervero, R. & Kockeman, K., Travel demand and the 3Ds: density, diversity and design: transportation research part D. Transport and Environment, 2(3), pp. 199–219, 1997. doi:http://dx.doi.org/10.1016/S1361-9209(97)00009-6
 Litman, T., Land Use Impacts on Transport: How Land Use Factors Affect Travel Behavior. Victory Transport Policy Institute, 2008, http://www.vtpi.org/landtravel.pdf
 Lautso, K., Spiekermann, K., Wegener, M., Sheppard, I., Steadman, P., Martinus, A., Domingo, R. & Gayda, S., PROPOLIS: Planning and Research of Policies for Land Use and Transport for Increasing Urban Sustainability, 2nd edn, European Commission, Thematic Energy Program, Environmental and Sustainable Development: Helsinky, 2004.
 Litman, T., Sustainable transportation indicators: a recommended program to defi ne a standard set of indicators for sustainable transportation planning. Transportation Research Board, 2008, http://www.vtpi.org/sustain/sti.pdf
 Wegener, M. & Fürst, F., Land-Use Transport Interaction: State of the Art. IRPUD, Dortmund University: Dortmund, Germany, 1999, http://188.8.131.52/eps/urb/papers/0409/0409005.pdf
 Stead, D. & Marshall, S., The relationships between urban form and travel patterns. An international review and evaluation. European Journal of Transport and Infrastructure Research, 1(2), pp. 113–141, 2001.
 Liu, S. & Zhu, X., Accessibility analyst: an integrated GIS tool for accessibility analysis in urban transportation planning. Environment and Planning B: Planning and Design 2004, 31(1), pp. 105–124, 2003. doi:http://dx.doi.org/10.1068/b305
 De Sousa, D., Sustainable Urban form, Accessibility and Travel: the Relationship between Polycentric Urban Development and Commuting in Lisbon. Architectural School, Planning and Landscape, University of Newcastle: Newcastle, 2008, https://theses.ncl.ac.uk/dspace/bitstream/10443/122/1/vale09.pdf
 Newman, P. & Kenworthy, J., Urban design to reduce automobile dependence. Opolis: An International Journal of Suburban and Metropolitan Studies, 2(1), pp. 35–52, 2006.
 Milakis, D., Vlastos, T. & Barbopoulos, N., Relationships between urban form and travel behavior in Athens, Greece: a comparison with western European and North American results. European Journal of Transport and Infrastructure Research, 8(3), pp. 201–215, 2007.
 Van Acker, V. & Witlox, F., Exploring the Relationships between Land-use System and Travel Behavior: Some First Findings. European Regional Science Association, Vrije University: Amsterdam, 2005, http://www-sre.wu-wien.ac.at/ersa/ersaconfs/ersa05/papers/601.pdf
 Bertaud, A., The spatial organization of cities: deliberate outcome or unforeseen consequence? World Development Report 2003, Dynamic Development in a Sustainable World, Background Paper, http://www.econ.worldbank.org/fi les/15934_Bertraud.pdf
 Lawrence, D.F. & Pivo, G., Impacts of mixed use and density on utilization of three modes of travel: single-occupant vehicle, transit, and walking. Transportation Research Record, 1466, pp. 44–52, 1994.
 Consejo Nacional de Población (Conapo)-Secretaría de Desarrollo Social (Sedesol)-Instituto Nacional de Estadística, Geografía e Informática (NEGI), Delimitación de las zonas metropolitanas de México, 2007, http://www.conapo.gob.mx/index.php?option=com_content&view=article&id=133&Itemid=212
 Instituto Municipal de Planeación (Implan), Programa de desarrollo urbano de centro de población de la ciudad de Tijuana. XIX Ayuntamiento de Tijuana: Tijuana, BC, 2009.
 San Diego Association of Governments (Sandag), Fast Facts. San Diego Association of Governments: San Diego, CA, 2007, http://www.sandag.org/resources/demographics_and_other_data/demographics/fastfacts/regi.htm
 Gangster, P. ed., Border Environmental: A Road to a Sustainable 2020, SCERP Monograph Series, no. 1, St. James State University Press: St. Diego, 2000.
 Secretaría de Medio Ambiente y Recursos Naturales-Gobierno del Estado de Baja California, Programa para mejorar la calidad del aire en Tijuana-Rosarito, México: Secretaría del Medio ambiente y Recursos Naturales, 2000, http://www2.ine.gob.mx/publicaciones/consultaPublicacion.html?id_pub=328
 Instituto Municipal de Planeación (Implan), Plan maestro de vialidad y transporte para la ciudad de Tijuana, BC, Tijuana, BC, 2006.
 Instituto Nacional de Estadística Geografía e Informática (INEGI), II Conteo de Población yVivienda, 2005, http://www.inegi.gob.mx/est/default.aspx?c=6848&pred=1
 Instituto Nacional de Estadística Geografía e Informática (INEGI), Censo económico, 2004.