Kathryn Stewart has a background in mathematics and works primarily within areas of mathematical modelling and optimisation of transport systems. She currently teaches mathematics to first and second year undergraduate students.
Stewart, K. (2007). Tolling traffic links under stochastic assignment: Modelling the relationship between the number and price level of tolled links and optimal traffic flows. Transportation Research Part A: Policy and Practice. 41, 644-654. doi:10.1016/j.tra.2006.09.015. ISSN 0965-8564
The classical road-tolling problem is to toll network links such that under the principles of Wardropian User Equilibrium Assignment a System Optimising (SO) flow pattern is o...
Stewart, K. & Maher, M. (2006). Minimal revenue network tolling: system optimisation under stochastic assignment. In Hearn, D. W., Smith, M. J. & Lawphongpanich, S. (Eds.). Mathematical and Computational Models for Congestion Charging, 201-218. Springer. doi:10.1007/0-387-29645-X_9. ISBN 978-0-387-29644-9
The classical road tolling problem is to toll network links such that, under the principles of Wardropian User Equilibrium (UE) assignment, a System Optimising (SO) flow patte...
Maher, M., Stewart, K. & Rosa, A. (2005). Stochastic social optimum traffic assignment. Transportation Research Part B: Methodological. 39, 753-767. doi:10.1016/j.trb.2004.10.001. ISSN 0191-2615
This paper formulates a Stochastic Social Optimum (SSO) that relates to the Stochastic User Equilibrium (SUE) in the same way as the Social Optimum (SO) relates to the User Eq...
Stewart, K. & McHale, A. (2013). Cycle lanes: their effect on driver passing distances in urban areas. Transport. 29, 307-316. doi:10.3846/16484142.2014.953205. ISSN 1648-4142
The current literature in the field of cycle lanes has often shown contradictory evidence as to the benefits and risks of cycle lanes and previous work has specifically shown ...
Ge, Y., Stewart, K., Liu, Y., Tang, C. & Liu, B. (2014). Investigating boundary effects of congestion charging in a single bottleneck scenario. Transport. , 1-15. ISSN 1648-4142
This paper investigates the impact of realistic congestion charging regimes where
undesired boundary effects of imposing charges may occur and may be both
temporal and spatial...
Stewart, K. (2009). Modelling Impacts of Tolling Systems with Multiple User Classes. In Saleh, W. (Ed.). Travel Demand Management and Road User Pricing, 73-88. Ashgate. ISBN 978-0-7546-7303-3
This paper extends the formulation for SSO to include MUCs (where the different groups of drivers are assigned different generalised cost functions), such that total perceived...
Stewart, K. & Ge, Y. (2013). Optimising time-varying network flows by low-revenue tolling under dynamic user equilibrium. European journal of transport and infrastructure research. 14, 30-45. ISSN 1567-7141
This paper presents a dynamic congestion charging framework that includes a dynamic user equilibrium (DUE) network model to optimize a tolling scheme, whose objective(s) may b...
Stewart, K. & Ge, Y. (2015). Dynamic congestion charging: Investigating boundary effects when applying low-revenue tolls. International Journal of Transportation. 3(2), 17-30. ISSN 2287-7940
This paper investigates the impact of realistic congestion charging regimes where undesired boundary effects of imposing charges may occur and may be both temporal and spatial...
Ge, Y., Stewart, K., Sun, B., Ban, X. & Zhang, S. (2013). Investigating undesired spatial and temporal boundary effects of congestion charging. Transportmetrica B: Transport Dynamics. , 1-23. doi:10.1080/21680566.2014.961044. ISSN 2168-0566
Two types of reported problems are related to the existing congestion charging projects that levy traffic only in a certain area within one or a few time periods during the da...
Stewart, K. & Ge, Y. Optimising network flows by low-revenue tolling under the principles of dynamic user equilibrium. Paper presented at 5th IMA International conference on Mathematics in Transport, UCL, London
Stewart, K., O'Dolan, C. & Carreno, M. Evaluating the impact of innovative cycling measures in EU cycling cities. Paper presented at 7th International Travel Demand Management Symposium, University of Arizona, Tucson, Arizona USA
The impact of “softer” measures to improve cycling mode share are often difficult to quantify and
assess. The CHAMP project is an Intelligent Energy Europe funded project whic...
McHale, A. & Stewart, K. Cycle lanes: their effect on driver passing distances in urban areas. Paper presented at 45th Annual Conference of the University Transport Study Group, Oxford University
The current literature in the field of cycle lanes has shown often contradictory
evidence as to the benefits and risks of cycle lanes and previous work has specifically
Stewart, K., Fonzone, A. & Cooper, J. Assessing the Carbon Impact of ICT measures. Paper presented at 10th Annual Scottish Transport Research and Applications Conference, Glasgow
Meade, S. & Stewart, K. Vulnerable Road User (VRU) Injury Collisions on Irish Roads, 2006-2012: An Analysis of CT68 Data. Paper presented at 11th Annual Scottish Transport Research and Applications Conference, Glasgow, Scotland
Appiah, J., Saleh, W. & Stewart, K. Evaluation of existing car-following models and calibration parameters using real time series data. Paper presented at 47th Annual Conference of the University Transport Study Group, London City University
O'Dolan, C., Stewart, K. & Tricker, R. Evaluating the impact of innovative cycling measures in EU cycling cities. Paper presented at 10th Annual Scottish Transport Research and Applications Conference, Glasgow
Stewart, K. & Ge, Y. Dynamic congestion charging-investigating boundary effects when applying low revenue tolls. Paper presented at 6th International Travel Demand Management Symposium, Dalian, China
Stewart, K. & Fonzone, A. Assessing the Carbon Impact of ICT measures. Paper presented at 7th International Travel Demand Management Symposium, University of Arizona, Tucson, Arizona USA
Martinez, E. & Stewart, K. Modelling behavioural responses to road tolling. Paper presented at 44th Annual Conference of the University Transport Study Group, University of Aberdeen
Microsimulation modelling is a widely accepted tool in the assessment of the impact of a wide
variety of transport schemes. The robustness of a model depends on the accuracy w...
Ge, Y. & Stewart, K. Investigating spatial and temporal undesired boundary effects arising from congestion charging. Paper presented at DTA 2012; 4th International Symposium on Dynamic Traffic Assignment, Marthas Vinyard, USA
Stewart, K. & Ge, Y. Dynamic congestion charging-Investigating boundary effects when applying low revenue tolls. Paper presented at The Operations Research Society OR54 Conference, The University of Edinburgh
Stewart, K. & Maher, M. (2006). Minimal revenue network tolling: system optimisation under stochastic assignment with elastic demand. In Allsop, R. E. & Heydecker, B. (Eds.). Mathematics in transport : selected proceedings of the 4th IMA International Conference on Mathematics in Transport : in honour of Richard Allsop, 201-218. ISBN 9780080536767
Stewart, K. & Ge, Y. (2010). Dynamic congestion charging: optimising network flows with variable tolling periods. In Szeto, W. Y., Wong, S. C. & Sze, N. N. (Eds.). TransportdynamicsISBN 978-988-98847-9-6
Ge, Y. & Stewart, K. (2009). Investigating boundary issues arising from congestion. In New Developments in Transport Planning, 303-326. doi:10.4337/9781781000809.00025. ISBN 978-1-84844-963-3
Biosca, O., Ulied, A., Bielefeldt, C., Calvet, M., Larrea, E., de Stasio, C., …Stewart, K. (2013). COMPASS: optimised co-modal passenger transport fro reducing carbon emissions - An assessment of the potential impact of ICT solutions on a co-modal transport system. Edinburgh, Scotland: European Commission
This deliverable is the synthesis of the work carried out in WP6 of the COMPASS project, centred on
the assessment of ITS transport solutions to improve co-modality in Europe....
Biosca, O., Ulied, A., Caramanico, G., Bielefeldt, C., Calvet, M., Carreras, B., …Franchi, L. (2013). Compass: Optimised co-modal passenger transport fro reducing carbon emissions: Handbook of ICT solutions for improving co-modality in passenger transport. Edinburgh, Scotland: European Commission
The COMPASS Handbook of ICT Solutions puts together a set of 96 solutions applying to urban and
metropolitan mobility, long distance passenger transport and also innovative IC...
Bielefeldt, C., Bak, M., Borkowski, P., Carreno, M., Matthews, B., Stewart, K., …Schnell, O. (2013). COMPASS: optimised co-modal passenger transport for reducing carbon emissions – Final results and Conclusions. Edinburgh, Scotland: European Commission
The motivation and the general objectives of the COMPASS project are deeply rooted in the European
Transport Policy (ETP) in the first decade of the 21st Cen...
Collaborative project with consultancies and leading ("champion") cycling cities across Europe to understand how they have become champions and to disseminate this knowledge to others. Napier is play...
Vulnerable Road User (VRU) road safety performance lags behind the improvements achieved among motorised users despite having the same road safety tar...
Transport policies are developed to manage the social, environmental and economic impacts caused by transportation activity. Inappropriately designed...
The growing fatality of road traffic accidents in most cities constitutes a p...