Imperial Fringe



Our research group within the Transport Strategy Centre is led by Director of Research, Professor Dan Graham.

Our team of four Postdoctoral Research Associates and ten Research Postgraduates (PhD candidates) has a diverse profile in various fields of transport research, including quantitative as well as theoretical areas at the crossroad between applied economics, statistical modelling, econometrics, civil engineering and data science.

The group’s main objective is to contribute to the scientific dialogue surrounding planning and policy problems in transport through publications in top-tier peer-reviewed journals and conference presentations.

Our Role Within TSC

Our research group works in close collaboration with the applied research branch of the TSC and its international benchmarking groups. Research group members are involved in case studies and statistical analyses prepared as part of benchmarking cycles on a regular basis.

The research group contributes to the continuous revision and improvement of the statistical methodology behind the system of key performance indicators. Our group members are regular attendees of various meetings of the benchmarking groups facilitated by the TSC.

Recent Publications

  1. Graham, D.J. (2021) Causal inference for ex post evaluation of transport interventions. In: Vickerman, Roger (eds.) International Encyclopedia of Transportation. vol. 1. UK: Elsevier Ltd.
  2. Hörcher, D. (2021) Value of crowding. In: Vickerman, Roger (eds.) International Encyclopedia of Transportation. vol. 1, pp. 84-88. UK: Elsevier Ltd.
  3. Monchambert, G., Hörcher, D., Coulombel, N., Tirachini, A. (2021) Subway systems. In: Vickerman, Roger (eds.) International Encyclopedia of Transportation. vol. 1. UK: Elsevier Ltd.
  4. Li, H., Zhu, M., Graham, D. J., & Ren, G. (2021). Evaluating the speed camera sites selection criteria in the UKJournal of Safety Research76, 90-100.
  5. Kazemzadeh, K., & Bansal, P. (2021). Electric bike navigation comfort in pedestrian crowdsSustainable Cities and Society69, 102841.
  6. Hörcher, D., Singh, R., & Graham, D. J. (2021). Social distancing in public transport: mobilising new technologies for demand management under the Covid-19 crisisTransportation, 1-30.
  7. Hörcher, D., & Tirachini, A. (2021). A review of public transport economicsEconomics of Transportation25, 100196.
  8. Xuto, P., Anderson, R. J., Graham, D. J., & Hörcher, D. (2021). Optimal infrastructure reinvestment in urban rail systems: A dynamic supply optimisation approachTransportation Research Part A: Policy and Practice147, 251-268.
  9. Ait Bihi Ouali, L., & Graham, D. J. (2021). The impact of the MeToo scandal on women’s perceptions of securityTransportation Research Part A: Policy and Practice147, 269-283.
  10. Bansal, P., Dua, R., Krueger, R., & Graham, D. J. (2021). Fuel Economy Valuation and Preferences of Indian Two-wheeler BuyersJournal of Cleaner Production, 126328.
  11. Bansal, P., Krueger, R., & Graham, D. J. (2021). Fast Bayesian estimation of spatial count data modelsComputational Statistics & Data Analysis157, 107152.
  12. Zhang, N., Graham, D. J., Hörcher, D., & Bansal, P. (2021). A causal inference approach to measure the vulnerability of urban metro systems. Transportation
  13. Ma, L., Graham, D. J., & Stettler, M. E. (2021). Air quality impacts of new public transport provision: A causal analysis of the Jubilee Line Extension in LondonAtmospheric Environment245, 118025.

Our Publications in 2020

  1. Li, H., Zhu, M., Graham, D. J., & Ren, G. (2020). Evaluating the speed camera sites selection criteria in the UK. Journal of Safety Research.
  2. Carbo, J. M., & Graham, D. J. (2020). Quantifying the impacts of air transportation on economic productivity: a quasi-experimental causal analysis. Economics of Transportation24, 100195.
  3. Anupriya, Graham, D. J., Hörcher, D., Anderson, R. J., & Bansal, P. (2020). Quantifying the ex-post causal impact of differential pricing on commuter trip scheduling in Hong Kong. Transportation Research Part A: Policy and Practice141, 16-34.
  4. Li, H., Wu, D., Graham, D. J., & Sze, N. N. (2020). Comparison of exposure in pedestrian crash analyses: A study based on zonal origin-destination survey data. Safety Science131, 104926.
  5. Singh, R., Graham, D. J., & Anderson, R. J. (2020). Quantifying the effects of passenger-level heterogeneity on transit journey times. Data-Centric Engineering1.
  6. Hörcher, D., & Graham, D. J. (2020). The Gini index of demand imbalances in public transport. Transportation, 1-24.
  7. Anupriya, Graham, D. J., Carbo, J. M., Anderson, R. J., & Bansal, P. (2020). Understanding the costs of urban rail transport operations. Transportation Research Part B: Methodological138, 292-316.
  8. Ait Bihi Ouali, L., Carbo, J. M., & Graham, D. J. (2020). Do changes in air transportation affect productivity? A cross‐country panel approach. Regional Science Policy & Practice12(3), 493-505.
  9. Ait Bihi Ouali, L., Graham, D. J., Barron, A., & Trompet, M. (2020). Gender differences in the perception of safety in public transport. Journal of the Royal Statistical Society: Series A (Statistics in Society)183(3), 737-769.
  10. Hörcher, D., & Graham, D. J. (2020). MaaS economics: Should we fight car ownership with subscriptions to alternative modes?. Economics of Transportation22, 100167.
  11. Li, H., Zhu, M., Graham, D. J., & Zhang, Y. (2020). Are multiple speed cameras more effective than a single one? Causal analysis of the safety impacts of multiple speed cameras. Accident Analysis & Prevention139, 105488.
  12. Singh, R., Hörcher, D., Graham, D. J., & Anderson, R. J. (2020). Decomposing journey times on urban metro systems via semiparametric mixed methods. Transportation Research Part C: Emerging Technologies114, 140-163.
  13. Zhang, F., & Graham, D. J. (2020). Air transport and economic growth: a review of the impact mechanism and causal relationships. Transport Reviews40(4), 506-528.
  14. Morse, L., Trompet, M., Barron, A., Anderson, R., & Graham, D. J. (2020). A benchmarking framework for understanding bus performance in the US. Benchmarking: An International Journal.
  15. Hörcher, D., De Borger, B., Seifu, W., & Graham, D. J. (2020). Public transport provision under agglomeration economies. Regional Science and Urban Economics81, 103503.


Research Areas

Our core fields of research interest include causal inference analysis of various topics spanning between urban economics through accident research to the statistical assessment of transport policies using large-scale public transport datasets. We are a leading research group in the measurement of urban agglomeration economies and applications in investment appraisal and cost-benefit analysis.

The group actively participates in the international community of transport economics, with both theoretical and empirical analyses, most importantly in topics related to pricing and capacity optimisation, cost modelling and benchmarking in public transport. In recent years we gained experience in the disaggregate statistical analysis of large-scale smart card and vehicle location datasets, focusing on the measurement of the user cost of crowding, passenger-to-train assignment, the decomposition of journey time components, and incident detection and prevention.

Academic Research Group Members

Research Group Members

PhD Candidates


Piyapong Jiwattanakulpaisarn

Piyapong Jiwattanakulpaisarn,

Piyapong Jiwattanakulpaisarn