Introduction
WHO WE ARE
Our research group within the Transport Strategy Centre is led by Professor Dan Graham, co-Director of the TSC.
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.
Join our research group
Recent Publications
- Acharya, P. S., AitBihiOuali, L., Matthews, H. S., & Graham, D. J. (2023). The Impact of Periodic Passenger Vehicle Safety Inspection Programs on Roadway Fatalities: Evidence from US States Using Panel Data. Journal of Transportation Engineering, Part A: Systems, 149(7), 04023052.
- Anupriya, Bansal, P., & Graham, D. J. (2023). Congestion in cities: Can road capacity expansions provide a solution?. Transportation Research Part A: Policy and Practice, 174, 103726.
- Anupriya, Graham, D. J., Bansal, P., Hörcher, D., & Anderson, R. (2023). Optimal congestion control strategies for near-capacity urban metros: Informing intervention via fundamental diagrams. Physica A: Statistical Mechanics and its Applications, 609, 128390.
- Awad, F. A., Graham, D. J., AitBihiOuali, L., & Singh, R. (2023). Performance of urban rail transit: a review of measures and interdependencies. Transport Reviews, 43(4), 698-725.
- Awad, F. A., Graham, D. J., AitBihiOuali, L., Singh, R., & Barron, A. (2023). Benchmarking the performance of urban rail transit systems: a machine learning application. Transportmetrica A: Transport Science, 2241566.
- Awad, F. A., Graham, D. J., Singh, R., & AitBihiOuali, L. (2023). Predicting urban rail transit safety via artificial neural networks. Safety science, 167, 106282.
- Gong, Z., Zhang, F., Liu, W., & Graham, D. J. (2023). On the effects of airport capacity expansion under responsive airlines and elastic passenger demand. Transportation Research Part B: Methodological, 170, 48-76.
- Hörcher, D., De Borger, B., & Graham, D. J. (2023). Subsidised transport services in a fiscal federation: Why local governments may be against decentralised service provision. Economics of Transportation, 34, 100312.
- Luo, Y., Graham, D. J., & McCoy, E. J. (2023). Semiparametric Bayesian doubly robust causal estimation. Journal of Statistical Planning and Inference, 225, 171-187.
- Ma, L., Graham, D. J., & Stettler, M. E. (2023). Using Explainable Machine Learning to Interpret the Effects of Policies on Air Pollution: COVID-19 Lockdown in London. Environmental Science & Technology.
- Singh, R., Hörcher, D., & Graham, D. J. (2023). An evaluation framework for operational interventions on urban mass public transport during a pandemic. Scientific Reports, 13(1), 5163.
- Xu, M., Anupriya, & Bansal, P. (2023). Surge pricing and consumer surplus in the ride-hailing market: Evidence from China. Travel Behaviour and Society, 33, 100638.
- Xuto, P., Anderson, R. J., Graham, D. J., & Hörcher, D. (2023). Sustainable urban rail funding: Insights from a century-long global dataset. Transport Policy, 130, 100-115.
- Xuto, P., Bansal, P., Anderson, R. J., Graham, D. J., Hörcher, D., & Barron, A. (2023). Examining the impacts of capital investment in London’s Underground: A long-term analysis. Transportation Research Part A: Policy and Practice, 175, 103744.
- Zimmo, I., Hörcher, D., Singh, R., & Graham, D. J. (2023). Benchmarking Travel Time and Demand Prediction Methods Using Large-scale Metro Smart Card Data. Periodica Polytechnica Transportation Engineering.
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.
Our research
Our research
Academic Research Group Members
Research Group Members
Daniel J. Graham
Daniel J. Graham
Professor of Statistical Modelling
Daniel Hörcher
Daniel Hörcher
Postdoctoral Research Associate
PhD Candidates
Kailin Chen
Kailin Chen
PhD Candidate
Tobie Cusson
Tobie Cusson
PhD Candidate
Supraja, Hariharan
Supraja, Hariharan
PhD Candidate
Jia Ming Li
Jia Ming Li
PhD Candidate
Surabhi Ojha
Surabhi Ojha
PhD Candidate
Alumni
Farah Awad
Farah Awad
PhD Alumni
Ramandeep Singh
Ramandeep Singh
PhD and Postdoc Alumni
Haojie Li
Haojie Li
PhD Alumni
Csaba Pogonyi
Csaba Pogonyi
PhD Alumni
Shane Canavan
Shane Canavan
PhD Alumni
Zia Wadud
Zia Wadud
PhD Alumni
Praj Xuto
Praj Xuto
PhD Alumni
Our Publications in 2022
- Anupriya, Graham, D. J., Bansal, P., Hörcher, D., & Anderson, R. (2022). Optimal congestion control strategies for near-capacity urban metros: Informing intervention via fundamental diagrams. Physica A: Statistical Mechanics and its Applications, 128390.
- Anupriya, Bansal, P., & Graham, D. J. (2022). Modelling the propagation of infectious disease via transportation networks. Scientific Reports, 12(1), 1-12.
- Zhang, N., Graham, D. J., Bansal, P., & Hörcher, D. (2022). Detecting metro service disruptions via large-scale vehicle location data. Transportation Research Part C: Emerging Technologies, 144, 103880.
- Xuto, P., Anderson, R. J., Graham, D. J., & Hörcher, D. (2022). Sustainable urban rail funding: Insights from a century-long global dataset. Transport Policy.
- Graham, D. J., & Singh, R. (2022). Model-based adjustment for conditional benchmarking. IMA Journal of Management Mathematics, 33(3), 381-393.
- Bansal, P., Kessels, R., Krueger, R., & Graham, D. J. (2022). Preferences for using the London Underground during the COVID-19 pandemic. Transportation Research Part A: Policy and Practice, 160, 45-60.
- Hörcher, D., & Graham, D. J. (2022). Multimodal substitutes in public transport: Efficient variety or wasteful competition?. Journal of Transport Economics and Policy (JTEP), 56(1), 1-27.
- Singh, R., Sood, R., & Graham, D. J. (2022). Road traffic casualties in Great Britain at daylight savings time transitions: a causal regression discontinuity design analysis. BMJ open, 12(4), e054678.
- Bansal, P., Hörcher, D., & Graham, D. J. (2022). A dynamic choice model to estimate the user cost of crowding with large scale transit data. J. Roy. Stat. Soc.: Ser. A, 2022, 1-25.
- Hörcher, D., Singh, R., & Graham, D. J. (2022). Social distancing in public transport: mobilising new technologies for demand management under the Covid-19 crisis. Transportation, 49(2), 735-764.
- Graham, D. J., Hörcher, D., & Vickerman, R. (2022). Infrastructure and the competitiveness of cities. In: Gómez-Ibáñez, J. & Liu, Z. (Eds) Infrastructure Economics and Policy: International Perspectives. Lincoln Institute of Land Policy, Cambridge, Mass., USA, pp. 120-139.
Our Publications in 2021
- Singh, R., Graham, D. J., Hörcher, D., & Anderson, R. J. (2021). The boundary between random and non-random passenger arrivals: Robust empirical evidence and economic implications. Transportation Research Part C: Emerging Technologies, 130, 103267.
- Ait Bihi Ouali, L., Musuuga, D., & Graham, D. J. (2021). Quantifying responses to changes in the jurisdiction of a congestion charge: A study of the London western extension. PloS one, 16(7), e0253881.
- 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.
- Hörcher, D. (2021) Value of crowding. In: Vickerman, Roger (eds.) International Encyclopedia of Transportation. vol. 1, pp. 84-88. UK: Elsevier Ltd.
- Monchambert, G., Hörcher, D., Coulombel, N., Tirachini, A. (2021) Subway systems. In: Vickerman, Roger (eds.) International Encyclopedia of Transportation. vol. 1. UK: Elsevier Ltd.
- Li, H., Zhu, M., Graham, D. J., & Ren, G. (2021). Evaluating the speed camera sites selection criteria in the UK. Journal of Safety Research, 76, 90-100.
- Kazemzadeh, K., & Bansal, P. (2021). Electric bike navigation comfort in pedestrian crowds. Sustainable Cities and Society, 69, 102841.
- Hörcher, D., Singh, R., & Graham, D. J. (2021). Social distancing in public transport: mobilising new technologies for demand management under the Covid-19 crisis. Transportation, 1-30.
- Hörcher, D., & Tirachini, A. (2021). A review of public transport economics. Economics of Transportation, 25, 100196.
- Xuto, P., Anderson, R. J., Graham, D. J., & Hörcher, D. (2021). Optimal infrastructure reinvestment in urban rail systems: A dynamic supply optimisation approach. Transportation Research Part A: Policy and Practice, 147, 251-268.
- Ait Bihi Ouali, L., & Graham, D. J. (2021). The impact of the MeToo scandal on women’s perceptions of security. Transportation Research Part A: Policy and Practice, 147, 269-283.
- Bansal, P., Dua, R., Krueger, R., & Graham, D. J. (2021). Fuel Economy Valuation and Preferences of Indian Two-wheeler Buyers. Journal of Cleaner Production, 126328.
- Bansal, P., Krueger, R., & Graham, D. J. (2021). Fast Bayesian estimation of spatial count data models. Computational Statistics & Data Analysis, 157, 107152.
- Zhang, N., Graham, D. J., Hörcher, D., & Bansal, P. (2021). A causal inference approach to measure the vulnerability of urban metro systems. Transportation
- 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 London. Atmospheric Environment, 245, 118025.
Our Publications in 2020
- Li, H., Zhu, M., Graham, D. J., & Ren, G. (2020). Evaluating the speed camera sites selection criteria in the UK. Journal of Safety Research.
- Carbo, J. M., & Graham, D. J. (2020). Quantifying the impacts of air transportation on economic productivity: a quasi-experimental causal analysis. Economics of Transportation, 24, 100195.
- 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 Practice, 141, 16-34.
- 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 Science, 131, 104926.
- Singh, R., Graham, D. J., & Anderson, R. J. (2020). Quantifying the effects of passenger-level heterogeneity on transit journey times. Data-Centric Engineering, 1.
- Hörcher, D., & Graham, D. J. (2020). The Gini index of demand imbalances in public transport. Transportation, 1-24.
- 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: Methodological, 138, 292-316.
- 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 & Practice, 12(3), 493-505.
- 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.
- Hörcher, D., & Graham, D. J. (2020). MaaS economics: Should we fight car ownership with subscriptions to alternative modes?. Economics of Transportation, 22, 100167.
- 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 & Prevention, 139, 105488.
- 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 Technologies, 114, 140-163.
- Zhang, F., & Graham, D. J. (2020). Air transport and economic growth: a review of the impact mechanism and causal relationships. Transport Reviews, 40(4), 506-528.
- 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.
- Hörcher, D., De Borger, B., Seifu, W., & Graham, D. J. (2020). Public transport provision under agglomeration economies. Regional Science and Urban Economics, 81, 103503.
Contact us
Transport Strategy Centre
Department of Civil and Environmental Engineering
South Kensington Campus
Imperial College London
London SW7 2AZ - UK
enquiries.tsc@imperial.ac.uk or +44 (0)20 7594 5995
TSC Academic Research Contact
For further information please contact our Director of Research Professor Dan Graham.