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Open research questions in Urban Transport and Accessibility

1,448 gap statements mined from Urban Transport and Accessibility papers in our 7.9M-paper local library, which holds 6,840 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Limitations of the study and future study suggestions are presented in detail in Section 7. Finally, a summary of the main findings of the study and potential future research is provided.

    Footprints of the Future: Cleaner and Faster Transportation with Shared E-Scooter Operational Models · 2025 · DOI

  • The lack of understanding of the mechanistic connections between urbanization and rural lives. The need for a more nuanced understanding of rural development beyond the transition paradigm.

    Quantifying Rural Lifestyle Mobilities in China: A Spatio-temporal Accessibility Perspective on Livelihood Pathways · 2026 · DOI

  • It emphasizes the need to consider pedestrian-network constraints, reachable alternatives, and facility dependence in urban planning. The study also notes the importance of addressing the limitations of existing proximity-based planning approaches.

    Proximity in 15-Minute Living-Circle Planning: Mapping Service Redundancy and Critical Access Elements in Wuhan, China · 2026 · DOI

  • The lack of conclusive evidence on the potential mental health benefits of active mobility. The need for a critical examination of the evidence on active mobility and mental health. The complexity of the relationship between active mobility and mental health.

    Reconsidering the Mental Health Benefits of Active Mobility: A Critical Perspective on the World Health Organization’s “Win–Win” Narrative · 2026 · DOI

  • The study notes that socioeconomic differences may have weakened the association between walkability and obesity. The study identifies the challenge of measuring actual walking behavior, rather than just the potential for walking. The study notes the complexity of the relationship between walkability and obesity, and the need to consider various factors that influence this relationship.

    Evaluating the Impact of Social, Economic, and Built Environmental Factors on Obesity and Walkability · 2026 · DOI

  • The study notes that while walkability has been linked to obesity outcomes, the relationship is complex and influenced by various factors. The study aims to address this gap by examining the impact of social, economic, and built environmental factors on obesity and walkability.

    Evaluating the Impact of Social, Economic, and Built Environmental Factors on Obesity and Walkability · 2026 · DOI

  • The need to consider terrain variations in network-based accessibility assessments. The challenge of obtaining accurate and realistic accessibility assessments using traditional methods. The requirement for extensive network datasets, which are not always available to decision-makers.

    Walking to Public Transport: Rethinking Catchment Areas Considering Topography and Surrogate Buffers · 2025 · DOI

  • The need for more realistic accessibility assessments to support more realistic and equitable public transport planning. The lack of consideration of terrain variations in network-based accessibility assessments.

    Walking to Public Transport: Rethinking Catchment Areas Considering Topography and Surrogate Buffers · 2025 · DOI

  • The study notes the need to optimize hyperparameters for optimal RF performance.

    Revealing Spatial Patterns and Environmental Influences on Jogging Volume and Speed: Insights from Crowd-Sourced GPS Trajectory Data and Random Forest · 2025 · DOI

  • There is a lack of studies on the promotion of E-bike uses in cities with steep slopes and complex urban infrastructure. There is a need to adapt urban mobility policies to the unique topographical conditions of each city. There is a gap in the current regulatory limits for non-motorized vehicles in Chile, which may hinder the promotion of E-bike uses.

    Mapping the Dream: Designing Optimal E-Bike Routes in Valparaíso, Chile, Using a Multicriteria Analysis and an Experimental Study · 2025 · DOI

  • The inherent complexity and dynamism of cities require alternative data-driven approaches. Traditional methods for measuring urban vitality are often limited in scope and time-consuming. There is a need to analyze the influence of various factors on urban vitality and identify key determinants.

    Spatiotemporal Analysis of Urban Vitality and Its Drivers from a Human Mobility Perspective · 2025 · DOI

  • The study requires the integration of multiple data sources, including ride-hailing trajectories and remote sensing data. The study needs to account for the nonlinear effects of built environment factors on travel-related heat exposure.

    Mobilities in the Heat: Identifying Travel-Related Urban Heat Exposure and Its Built Environment Drivers Using Remote Sensing and Mobility Data in Chengdu, China · 2025 · DOI

  • The need to incorporate human perception into urban diversity estimation. The challenge of quantifying urban diversity using comprehensive and accurate methods.

    Towards More Reliable Measures for “Perceived Urban Diversity” Using Point of Interest (POI) and Geo-Tagged Photos · 2025 · DOI

  • It highlights the need to address spatial disparities in healthcare services. The study also notes the challenge of accurately reflecting actual demand behavior in accessibility models.

    Spatial Accessibility to Healthcare Facilities: GIS-Based Public–Private Comparative Analysis Using Floating Catchment Methods · 2025 · DOI

  • The study notes that housing price volatility and high costs in Seoul are persistent challenges for the region. The paper references the need for affordable housing near employment centers to reduce commuting times.

    The Effects of Employment Center Characteristics on Commuting Time: A Case Study of the Seoul Metropolitan Area · 2025 · DOI

  • The existing fire station layout strategy does not consider the spatial autocorrelation between fire distribution and fire station distribution. The maximum coverage principle has limitations, such as assuming that service demand is spatially uniform.

    Mapping Spatial Inequity in Urban Fire Service Provision: A Moran’s I Analysis of Station Pressure Distribution · 2025 · DOI

  • Future research should address the limitations of the current study to improve the generalizability of the results.

    Spatial Prediction of High-Risk Areas for Asthma in Metropolitan Areas: A Machine Learning Approach Applied to Tehran, Iran · 2025 · DOI

  • There is a need for a machine learning approach to predict asthma risk in urban areas. Prior studies have not identified key predictors of asthma prevalence in Tehran, Iran. There is a lack of research on the application of geographic information systems and remote sensing techniques to model and predict asthma risk.

    Spatial Prediction of High-Risk Areas for Asthma in Metropolitan Areas: A Machine Learning Approach Applied to Tehran, Iran · 2025 · DOI

  • The lack of understanding of how the community-scale built environment shapes the spatial heterogeneity of CVD prevalence. The need for place-specific, multi-scale planning measures to reduce the CVD burden. The importance of considering environmental factors and lifestyle in the development of CVD.

    A Multi-Scale Geographically Weighted Regression Approach to Understanding Community-Built Environment Determinants of Cardiovascular Disease: Evidence from Nanning, China · 2025 · DOI

  • The need to address sustainable urban livability has become clear. Spatial segregation in relation to economic disparity has become a pressing issue in urban settings. The challenge of land use planning being compromised by political interference and premature mandates.

    Development of a Fifteen-Minute City Index Using Walkability Scores and Age-Classified Population: The Case of Pasig City, Metro Manila, Philippines · 2025 · DOI

  • The complexity of urban rail transit systems and the need for a spatiotemporally dynamic and multi-scale analytical framework. The difficulty in quantifying the equity mechanisms underlying the spatiotemporal disparities in accessibility. The challenge of integrating multiple spatial analytical techniques to assess the equity and evolutionary patterns of accessibility.

    Spatiotemporal Dynamics and Multi-Scale Equity Evaluation of Urban Rail Accessibility: Evidence from Hangzhou · 2025 · DOI

  • Existing research focuses on connection frequency and neglects modal share. The literature has not moved beyond identifying integration itself to evaluating how efficiently bike-sharing performs relative to other feeder modes. Green exposure has rarely been treated as a dynamic pathway variable linking active mobility to health equity.

    Nonlinear effects of built environment on metro-feeder bike-sharing as a dynamic green exposure pathway: a dual perspective of connection frequency and modal share · 2026 · DOI

  • The traditional entropy-based approach is prone to bias or underestimation due to the modifiable areal unit problem.

    Towards More Reliable Measures for “Perceived Urban Diversity” Using Point of Interest (POI) and Geo-Tagged Photos · 2025 · DOI

  • Deeper examination of the spatial heterogeneity of life satisfaction at finer urban scales, - Analysis of micro-medium scale variability within cities, - Investigation of differences in life satisfaction across various geographic regions and community…

    RETRACTED: Unraveling Spatial Nonstationary and Nonlinear Dynamics in Life Satisfaction: Integrating Geospatial Analysis of Community Built Environment and Resident Perception via MGWR, GBDT, and XGBoost · 2025 · DOI

  • Further research can be conducted to explore the spatial autocorrelation of fire stations in other cities, - The study can be extended to include other factors that affect firefighting pressures, - The inter-regional firefighting behavior can be further…

    Mapping Spatial Inequity in Urban Fire Service Provision: A Moran’s I Analysis of Station Pressure Distribution · 2025 · DOI

Most-cited papers in Urban Transport and Accessibility

Most recent work

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Open questions raised by papers listed on this page include: (1) The lack of understanding of the mechanistic connections between urbanization and rural lives (“Quantifying Rural Lifestyle Mobilities in China: A Spatio-temporal…”, 2026); (2) The lack of conclusive evidence on the potential mental health benefits of active mobility (“Reconsidering the Mental Health Benefits of Active Mobility: A Critical…”, 2026); (3) The lack of consideration of terrain variations in network-based accessibility assessments (“Walking to Public Transport: Rethinking Catchment Areas Considering Topography…”, 2025); (4) There is a lack of studies on the promotion of E-bike uses in cities with steep slopes and complex urban infrastructure (“Mapping the Dream: Designing Optimal E-Bike Routes in Valparaíso, Chile, Using…”, 2025); (5) There is a need to analyze the influence of various factors on urban vitality and identify key determinants (“Spatiotemporal Analysis of Urban Vitality and Its Drivers from a Human Mobility…”, 2025). 1,448 gap statements have been mined from Urban Transport and Accessibility papers in our 7.9M-paper local library, which holds 6,840 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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