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Enriching OpenStreetMap network data for transportation applications: Insights into the impact of urban congestion on accessibility

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  • Acharya, Sailesh
  • Garikapati, Venu M.
  • Allen, Michael
  • Lyu, Mingdong
  • Hoehne, Christopher
  • Sharda, Shivam
  • Fitzgerald, Robert

Abstract

OpenStreetMap (OSM) data is a valuable open-source resource for various transportation, traffic, and planning applications. However, OSM network data lack operating traffic speed information, which is critical for transport planning and operations. Addressing this shortcoming, this study leverages commercial vendor data (to serve as ground truth) with exogenous, open-source variables characterizing local transport infrastructure, land use, and demographic information to predict average congested traffic speeds on OSM networks. Three machine-learning models were tested and estimated for OSM links with and without speed limit information in the Denver metropolitan region. Among these, XGBoost performed best, with mean absolute errors of 3.27 and 3.62 mph for links with and without speed limits, respectively. The developed models accurately predicted traffic speeds for different hours and days of the week compared to ground truth data. Using these predicted speeds, drive accessibility scores were computed for the Denver region for different time periods using the Mobility Energy Productivity (MEP) metric to understand the impact of congestion on energy-efficient accessibility. Results show that congestion-adjusted drive accessibility can be significantly lower compared to accessibility calculated using free flow speeds. Specifically, weekday evening hours saw a 42 % drop in accessibility due to reduced speeds, particularly around downtown Denver. Across the Denver metro region, approximately half as many opportunities and jobs are accessible in under 20 min by car during the evening peak period relative to free flow conditions. These findings underscore the importance of using congestion-adjusted operating speeds rather than speed limits in accessibility calculations, as reliance on speed limits can substantially overestimate energy-efficient drive accessibility in large, car-centric cities susceptible to significant congestion. The methodology presented here could further enrich OSM network data, making them useful for an even broader range of transportation applications.

Suggested Citation

  • Acharya, Sailesh & Garikapati, Venu M. & Allen, Michael & Lyu, Mingdong & Hoehne, Christopher & Sharda, Shivam & Fitzgerald, Robert, 2025. "Enriching OpenStreetMap network data for transportation applications: Insights into the impact of urban congestion on accessibility," Journal of Transport Geography, Elsevier, vol. 123(C).
    • Handle: RePEc:eee:jotrge:v:123:y:2025:i:c:s0966692324003053
    DOI: 10.1016/j.jtrangeo.2024.104096
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    References listed on IDEAS

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