Behrendt and Sheller’s concept of mobility data justice deepens this by showing that movement now generates data almost continuously. Ticketing systems, navigation apps, shared mobility platforms, sensors, vehicles, road infrastructures and environmental monitoring systems all produce traces. But datafication is uneven. Some movements are over-visible and surveilled. Others are absent, informal, too complex or institutionally ignored. MetadataSkin becomes important here because the outer informational layer attached to mobility users can determine how they are represented and governed. The skin is not superficial. It mediates access, risk and recognition. Recent work on mobility equity metrics attempts to formalise fairness within intelligent transportation systems. Bang and colleagues propose a metric combining service accessibility and transport cost, using distributional tools to evaluate fairness. Such work is valuable because it pushes equity into system design rather than treating it as a rhetorical appendix. Yet CitationalCommitment also asks what every metric leaves outside. A Gini coefficient may show distributional inequality, but it may not capture fear, heat, humiliation, disability friction, care work or attachment to place. Metrics must be treated as instruments, not substitutes for politics. AI-powered transportation digital twins add further complexity. Fu and colleagues describe cyber-physical transport twins with sensing, prediction, decision-making and feedback. Their distinction between a twin’s eyes and brain is useful: perception alone is insufficient without interpretation and response. But the political question remains: whose vulnerability does the twin detect? Vulnerable road users may be technically recognised while other vulnerable populations remain invisible. LegibleArchive becomes relevant because mobility data must not be only real-time flow. It must also preserve evidence, provenance, historical inequity and accountability over time. Climate makes mobility justice more material. Cabrera, Ziegler and Schläpfer’s work on targeted cooling of cycling networks shows that heat exposure concentrates unevenly across routes. A small portion of a network may generate disproportionate thermal burden. CDRI’s guidance on heat management in public transport similarly treats heat as an operational and equity issue. Shade, waiting, station design, vehicle comfort, hydration, surface temperature and elderly bodies become transport variables. Thermal stress reveals that access is never abstract. A route may exist and still be unusable under climatic pressure.
Bozkurt and colleagues’ research on smart-city data governance adds the institutional layer. Urban data requires standards, roles, access rules, interoperability, security, coordination and legitimacy. Without governance, data becomes either fragmented or captured. PublicSyntax becomes the third secondary operator because mobility justice needs a language that can circulate between citizens, planners, engineers, activists, researchers and institutions. Access must be publicly discussable. Otherwise, technical evidence remains trapped in expert systems. Yusuf and colleagues’ analysis of public transit data in Trondheim shows the practical side of this field. Historical passenger data, cleaned and enriched, can become the basis for dynamic modelling and future digital twins. But again the key issue is not only predictive capacity. Data quality determines what can be known, and what can be known determines what can be planned. Poor data produces poor justice when it becomes administrative truth. For Socioplastics, CitationalCommitment converts mobility data justice into a theory of responsible field construction. A corpus also counts, names, links and excludes. It creates pathways of access and zones of silence. The bibliography is therefore not external support; it is an ethical device. To cite is to make a relation visible. To omit is also to structure the field. At 6K, Socioplastics uses CitationalCommitment to make data, mobility and bibliography accountable to public access.
Bibliography
ITF (2024) Sustainable Accessibility for All. ITF Research Report. Paris: OECD Publishing.
Behrendt, F. and Sheller, M. (2024) ‘Mobility Data Justice’, Mobilities, 19(1), pp. 151–169.
Bang, H., Dave, A., Tzortzoglou, F.N. and Malikopoulos, A.A. (2024) ‘A Mobility Equity Metric for Multi-Modal Intelligent Transportation Systems’, arXiv:2405.17599.
Fu, Y., Turkcan, M.K., Ghasemi, M., Mo, Z., Zang, C., Adhikari, A., Kostic, Z., Zussman, G. and Di, X. (2026) ‘AI-Powered CPS-Enabled Vulnerable-User-Aware Urban Transportation Digital Twin: Methods and Applications’, arXiv:2501.10396v3.
Cabrera, A., Ziegler, D. and Schläpfer, M. (2025) ‘Targeted Cooling of Urban Cycling Networks for Heat-Resilient Mobility’, arXiv:2512.11753.
Bozkurt, Y., Rossmann, A., Pervez, Z. and Ramzan, N. (2025) ‘Assessing Data Governance Models for Smart Cities: Benchmarking Data Governance Models on the Basis of European Urban Requirements’, Sustainable Cities and Society, 130, 106528.
CDRI (2025) Community of Practice for Extreme Heat Management in Public Transport Systems: Guidance Document. New Delhi: Coalition for Disaster Resilient Infrastructure.
Yusuf, O., Rasheed, A., Lindseth, F. and Slaastuen, M. (2024) ‘Unveiling Urban Mobility Patterns: A Data-Driven Analysis of Public Transit’, arXiv:2404.02172.
Knieriem, M., Lagendijk, A. and van Leeuwen, B.R. (2025) ‘Beyond Displacement: Gentrification, Misrecognition and Resistance in Rotterdam’s Tweebosbuurt’, Cities, 167, 106329.
