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The bias in estimating accessibility inequalities using gravity-based metrics

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  • Giannotti, Mariana
  • Tomasiello, Diego B.
  • Bittencourt, Taina A.

Abstract

Accessibility measures have been extensively used to explore the outcomes of the spatial distribution of transport, jobs, and population groups in cities. Despite its wide use, identifying the population groups that most benefit from accessibility is not straightforward and different metrics might result in different conclusions. The present work aims to analyze the potential bias of using gravity-based measures based on revealed mobilities to identify job accessibility inequalities. By looking at two large and very different regions, the municipality of São Paulo (SP) and the Greater London Area (GLA), we argue that distance decay functions built from current trip behaviors should be carefully used in evaluations of accessibility inequalities because it may underestimate disparities between socio-occupational groups and also result in a misleading interpretation of impedance factors. Two distinct approaches were implemented to support those claims. We first estimate group-specific distance decay functions, considering only travel time. Secondly, we consider both travel time and travel cost relative to income to estimate zone-specific and city-specific distance decay functions for each one of the study areas. The population of both cases studies was stratified according to the NS-SEC standard to select the highest and the lowest socio-occupational groups and to explore job accessibility inequalities. It was found that higher-level and lower-level socio-occupational groups of SP and GLA present striking differences in terms of travel times and relative travel costs, with SP being more unequal. By applying the distance decay function of the lowest level socio-occupational group to the calculations of the job accessibility of the highest level group, and by adding travel cost to the analysis, we highlight inconsistencies between gravity-based accessibility calculations and theory, as trips taken by different groups can be mistakenly associated with willingness to travel. From a policy perspective, our findings emphasize that accessibility inequalities in large urban centers, especially in the Global South, can be underestimated if revealed mobilities are considered to represent the willingness to travel and by not taking into account the relative cost of travel.

Suggested Citation

  • Giannotti, Mariana & Tomasiello, Diego B. & Bittencourt, Taina A., 2022. "The bias in estimating accessibility inequalities using gravity-based metrics," Journal of Transport Geography, Elsevier, vol. 101(C).
    • Handle: RePEc:eee:jotrge:v:101:y:2022:i:c:s0966692322000606
    DOI: 10.1016/j.jtrangeo.2022.103337
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    References listed on IDEAS

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    1. Allen, W. Bruce & Liu, Dong & Singer, Scott, 1993. "Accesibility measures of U.S. metropolitan areas," Transportation Research Part B: Methodological, Elsevier, vol. 27(6), pages 439-449, December.
    2. Hernandez, Diego, 2018. "Uneven mobilities, uneven opportunities: Social distribution of public transport accessibility to jobs and education in Montevideo," Journal of Transport Geography, Elsevier, vol. 67(C), pages 119-125.
    3. Slovic, Anne Dorothée & Tomasiello, Diego Bogado & Giannotti, Mariana & Andrade, Maria de Fatima & Nardocci, Adelaide C., 2019. "The long road to achieving equity: Job accessibility restrictions and overlapping inequalities in the city of São Paulo," Journal of Transport Geography, Elsevier, vol. 78(C), pages 181-193.
    4. El-Geneidy, Ahmed & Levinson, David & Diab, Ehab & Boisjoly, Genevieve & Verbich, David & Loong, Charis, 2016. "The cost of equity: Assessing transit accessibility and social disparity using total travel cost," Transportation Research Part A: Policy and Practice, Elsevier, vol. 91(C), pages 302-316.
    5. Martínez, L. Miguel & Viegas, José Manuel, 2013. "A new approach to modelling distance-decay functions for accessibility assessment in transport studies," Journal of Transport Geography, Elsevier, vol. 26(C), pages 87-96.
    6. Foth, Nicole & Manaugh, Kevin & El-Geneidy, Ahmed M., 2013. "Towards equitable transit: examining transit accessibility and social need in Toronto, Canada, 1996–2006," Journal of Transport Geography, Elsevier, vol. 29(C), pages 1-10.
    7. Joseph, Alun E. & Bantock, Peter R., 1982. "Measuring potential physical accessibility to general practitioners in rural areas: A method and case study," Social Science & Medicine, Elsevier, vol. 16(1), pages 85-90, January.
    8. Karel Martens, 2012. "Justice in transport as justice in accessibility: applying Walzer’s ‘Spheres of Justice’ to the transport sector," Transportation, Springer, vol. 39(6), pages 1035-1053, November.
    9. Bocarejo S., Juan Pablo & Oviedo H., Daniel Ricardo, 2012. "Transport accessibility and social inequities: a tool for identification of mobility needs and evaluation of transport investments," Journal of Transport Geography, Elsevier, vol. 24(C), pages 142-154.
    10. Scott, Darren M. & Horner, Mark W., 2008. "Examining The Role of Urban Form In Shaping People’s Accessibility to Opportunities: An Exploratory Spatial Data Analysis," The Journal of Transport and Land Use, Center for Transportation Studies, University of Minnesota, vol. 1(2), pages 89-119.
    11. Hu, Yujie & Downs, Joni, 2019. "Measuring and visualizing place-based space-time job accessibility," Journal of Transport Geography, Elsevier, vol. 74(C), pages 278-288.
    12. Pritchard, John P. & Tomasiello, Diego Bogado & Giannotti, Mariana & Geurs, Karst, 2019. "Potential impacts of bike-and-ride on job accessibility and spatial equity in São Paulo, Brazil," Transportation Research Part A: Policy and Practice, Elsevier, vol. 121(C), pages 386-400.
    13. Dong Liu & Mei‐Po Kwan, 2020. "Measuring Job Accessibility Through Integrating Travel Time, Transit Fare And Income: A Study Of The Chicago Metropolitan Area," Tijdschrift voor Economische en Sociale Geografie, Royal Dutch Geographical Society KNAG, vol. 111(4), pages 671-685, September.
    14. Moon, Henry E., Jr., 1987. "Interstate Highway Interchanges Reshape Rural Communities," Rural America/ Rural Development Perspectives, United States Department of Agriculture, Economic Research Service, vol. 4(1), October.
    15. Banister, David, 2008. "The sustainable mobility paradigm," Transport Policy, Elsevier, vol. 15(2), pages 73-80, March.
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    1. van Wee, Bert & de Jong, Tom, 2023. "Differences in levels of accessibility: The importance of spatial scale when measuring distributions of the accessibility of health and emergency services," Journal of Transport Geography, Elsevier, vol. 106(C).
    2. Pinto, Davi Garcia Lopes & Loureiro, Carlos Felipe Grangeiro & Sousa, Francelino Franco Leite de Matos & Motte-Baumvol, Benjamin, 2023. "The effects of informality on socio-spatial inequalities in accessibility to job opportunities: Evidence from Fortaleza, Brazil," Journal of Transport Geography, Elsevier, vol. 108(C).

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