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Publications (10 of 18) Show all publications
Kristoffersson, I. & Pernestål Brenden, A. (2018). Scenarios for the development of self-driving vehicles in freight transport. In: Proceedings of 7th Transport Research Arena TRA2018: . Paper presented at 7th Transport Research Arena TRA 2018,16-19 April, Vienna.
Open this publication in new window or tab >>Scenarios for the development of self-driving vehicles in freight transport
2018 (English)In: Proceedings of 7th Transport Research Arena TRA2018, 2018Conference paper, Published paper (Refereed)
Abstract [en]

This paper extends previous research by developing future scenarios for self-driving vehicles and their societal impacts in freight transport using Sweden as a case study. Freight experts from vehicle manufacturers, agencies, universities and hauliers were recruited for a workshop where they assessed the benefits, costs, possibilities and barriers for self-driving vehicles in freight transport. The paper shows that reduction in driver and vehicle costs, reduced number of incidents and more fuel-efficient driving are seen as the main benefits of self-driving vehicles in freight transport, and increased vehicle costs, lost jobs, reduced degree of filling and more transport as the main costs. Furthermore, reduced drivers’ costs, more hours-of-service and new business models are identified as the main drivers of the development and traffic management, small hauliers, loading and unloading and cross-border transport as the main barriers. The paper also integrates the description of possible developments of self-driving vehicles in freight transport into the four future scenarios developed for passenger transport in Sweden.

Keywords
Self-driving vehicles, Automated transport, Freight transport, City logistics, Long haulage, Future scenarios, Societal scenarios
National Category
Transport Systems and Logistics
Research subject
Transport Science
Identifiers
urn:nbn:se:kth:diva-226557 (URN)
Conference
7th Transport Research Arena TRA 2018,16-19 April, Vienna
Funder
Integrated Transport Research Lab (ITRL)
Note

QC 20180604

This project was funded by the Integrated Transport Research Lab, KTH Royal Institute ofTechnology, and the Swedish Ministry of Enterprise and Innovation.

Available from: 2018-04-19 Created: 2018-04-19 Last updated: 2018-06-11Bibliographically approved
Kristoffersson, I. (2013). Impacts of time-varying cordon pricing: Validation and application of mesoscopic model for Stockholm. Transport Policy, 28(SI), 51-60
Open this publication in new window or tab >>Impacts of time-varying cordon pricing: Validation and application of mesoscopic model for Stockholm
2013 (English)In: Transport Policy, ISSN 0967-070X, E-ISSN 1879-310X, Vol. 28, no SI, p. 51-60Article in journal (Refereed) Published
Abstract [en]

This paper uses a simulation model to compare traffic and welfare effects of changes to the charging schedule currently in use in Stockholm. In particular, a step toll is compared to its flat counterpart at two charging levels. The increments between steps are also increased in a peaked step toll scenario. Furthermore, results from simulation of the current toll ring are compared to real-world measurements in a first attempt to validate model predictions regarding impacts of a time-varying congestion charging scheme. In the model, car users have the possibility to respond to congestion charging by changing departure time, route or switch to public transport and travel times are calculated using mesoscopic traffic simulation. Validation shows that departure time choice adjustments because of congestion charging are overestimated by the model that is based on stated preference data. This warrants further research on discrepancies between stated and revealed adjustments to congestion charging. The current step toll reaches the highest social benefit estimate in model predictions, but differences in traffic effects between the current step toll and its flat counterpart are rather small. Furthermore, results show that demand changes occur in the model to a considerably greater extent for trips with low value of time. The differences in welfare effects is for that reason large for different trip purposes, indicating the importance of accounting for heterogeneous trips when modelling effects of congestion charges.

Place, publisher, year, edition, pages
Pergamon Press, 2013
Keywords
Congestion charging, Departure time choice, Time-varying charges, Schedule flexibility, Traffic simulation
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-43718 (URN)10.1016/j.tranpol.2011.06.006 (DOI)000321405400006 ()2-s2.0-84878636686 (Scopus ID)
Projects
Avenir
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20130812

Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2017-12-08Bibliographically approved
Engelson, L., Kristoffersson, I., Saifuzzaman, M., de Palma, A. & Motamedi, K. (2012). Comparison of two dynamic transportation models: The case of Stockholm congestion charging. In: : . Paper presented at 4th Transportation Research Board Conference on Innovations in Travel Modeling. Tampa, USA
Open this publication in new window or tab >>Comparison of two dynamic transportation models: The case of Stockholm congestion charging
Show others...
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This paper reviews the transportation models used for predicting impacts of congestion charging in European cities and carries out in-depth comparison of two such models, METROPOLIS and SILVESTER. Both are mesoscopic dynamic models involving modal split and departure time choice calibrated for the Stockholm baseline situation without charges and applied for modeling effects of congestion charging. The results obtained from the two models are mutually compared and validated against actual outcome of the Stockholm congestion charging scheme.  Both models provide significant improvement in realism over static models. However results of cost benefit analysis differ substantially

Place, publisher, year, edition, pages
Tampa, USA: , 2012
Keywords
Congestion charges, Congestion pricing, Road pricing, Transportation models, Dynamic assignment, Mesoscopic models, Departure time choice
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-115990 (URN)
Conference
4th Transportation Research Board Conference on Innovations in Travel Modeling
Note

TSC import 2116 2013-01-15 QC 20130612

Available from: 2013-01-15 Created: 2013-01-15 Last updated: 2013-06-12Bibliographically approved
Eliasson, J., Börjesson, M., Hamilton, C. & Kristoffersson, I. (2012). Flexibel trängselskatt ger flyt åt Stockholmstrafiken: DN Debatt [Review]. Dagens nyheter
Open this publication in new window or tab >>Flexibel trängselskatt ger flyt åt Stockholmstrafiken: DN Debatt
2012 (Swedish)In: Dagens nyheter, ISSN 1101-2447Article, book review (Other (popular science, discussion, etc.)) Published
Abstract [en]

Omstridd skatt fyller sex. Trängselskattens påverkan på trafiken är till och med större i dag än när den infördes. Att många ändå upplever att köerna blivit längre beror på flera stora byggprojekt som påverkar kapaciteten på vägarna. Trängselskatten bör därför bli mer flexibel och anpassas efter vägarbeten, årstider etc. Essingeleden bör också snarast avgiftsbeläggas. Det skulle enkelt minska trafiken där med 13 procent och göra Stockholm effektivare, renare och trevligare, skriver fyra transportforskare.

Place, publisher, year, edition, pages
AB Dagens nyheter, 2012
National Category
Social Sciences
Identifiers
urn:nbn:se:kth:diva-183021 (URN)
Note

QC 20160225

Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2016-12-01Bibliographically approved
Börjesson, M. & Kristoffersson, I. (2012). Welfare effects of Stockholm congestion charges using dynamic network assignment. In: Proceedings of the Transportation Research Board (TRB) 91st Annual Meeting. Paper presented at Transportation Research Board (TRB) 91st Annual Meeting. Washington D.C. USA
Open this publication in new window or tab >>Welfare effects of Stockholm congestion charges using dynamic network assignment
2012 (English)In: Proceedings of the Transportation Research Board (TRB) 91st Annual Meeting, Washington D.C. USA, 2012Conference paper, Published paper (Refereed)
Abstract [en]

According to the standard textbook analysis, drivers as a group will be worse off with congestion charging if not compensated by revenues. This result is confirmed by an analysis of the Stockholm congestion charging scheme using a static model with homogenous users. However, both this static model and the standard textbook analysis omit three important factors: taste heterogeneity, effects of charges on the larger network arising from less blocking back of upstream links and behavioural adjustments in the temporal dimensions. Taking account of these factors, using a dynamic model with heterogeneous users in a large-scale network, we find that drivers as a group benefit directly from the charging scheme in Stockholm. This paper investigates the importance of the three factors omitted in the standard textbook and the static model analysis in the Stockholm case, finding that all three add significantly to the benefit of the charges.

Place, publisher, year, edition, pages
Washington D.C. USA: , 2012
Keywords
Congestion charges, Congestion pricing, Road pricing, Acceptability, Evaluation, Urban transport policy, Mobility management, Transport externalities, Policy implementation
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-86121 (URN)
Conference
Transportation Research Board (TRB) 91st Annual Meeting
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20111019

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-12-17Bibliographically approved
Kristoffersson, I. & Engelson, L. (2011). Alternativa vägavgiftssystem och individers resval.
Open this publication in new window or tab >>Alternativa vägavgiftssystem och individers resval
2011 (English)Report (Other academic)
Alternative title[en]
Alternative road pricing schemes and individual's travel choices
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-71755 (URN)
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
TSC import 878 2012-01-30. QC 20120210Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2012-06-12Bibliographically approved
Kristoffersson, I. & Engelson, L. (2011). Alternative Congestion Charging Schemes and their Equity Effects: Results of Simulations for Stockholm. Transportation Research Part A: Policy and Practice
Open this publication in new window or tab >>Alternative Congestion Charging Schemes and their Equity Effects: Results of Simulations for Stockholm
2011 (English)In: Transportation Research Part A: Policy and Practice, ISSN 0965-8564, E-ISSN 1879-2375Article in journal (Other academic) Submitted
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-71707 (URN)
Note
QS 2011 QS 20120316Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2017-12-08Bibliographically approved
Kristoffersson, I. & Engelson, L. (2011). Alternative road pricing schemes and their equity effects: Results of simulations for Stockholm. In: Proceedings of the TRB 90th Annual Meeting. Washington, D.C.
Open this publication in new window or tab >>Alternative road pricing schemes and their equity effects: Results of simulations for Stockholm
2011 (English)In: Proceedings of the TRB 90th Annual Meeting, Washington, D.C., 2011Conference paper, Published paper (Refereed)
Abstract [en]

This paper uses a newly developed transport model to analyze effects of alternative road pricing schemes. The responses to road pricing included in the model are departure time, mode and route choice. Traffic analysis is performed on a large urban network of Stockholm using mesoscopic simulation. The compared pricing schemes differ in toll location and charged amount. Through calculation of consumer surplus per geographical zone, effects of the road pricing schemes are analyzed per income group and geographical area in order to study equity effects. Simulation results suggest that road pricing can be both regressive and progressive depending on the design of the pricing scheme, this even before the use of revenues to compensate users. Results also indicate that there can be a disagreement between which pricing scheme is preferable from a congestion mitigating point of view and which is preferable when looking at equity effects.

Place, publisher, year, edition, pages
Washington, D.C.: , 2011
Keywords
Road pricing, Traffic simulation, Equity effects, Departure time choice
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-43730 (URN)
Projects
Avenir
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20111019Available from: 2011-10-18 Created: 2011-10-18 Last updated: 2011-11-21Bibliographically approved
Kristoffersson, I. (2011). Congestion Charging in Urban Networks: Modelling Issues and Simulated Effects. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Congestion Charging in Urban Networks: Modelling Issues and Simulated Effects
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the major challenges cities face today, in their development towards sustainable urban areas, is the need for an efficient and environmentally friendly transport system. This transport system should manage to tie together the city without strong adverse impact on urban environment, air-quality and climate change. The specialized labour (and leisure) market, typical of a large urban area, exaggerates the need for efficient travel, as it is increasingly difficult to live and work within short distances.   

The use of demand management tools has become more frequent in transport planning with this development towards more sustainable cities. Whereas investing in new capacity was previously the main response to increased demand for travel, there is a much broader range of policies in use today. One of these demand management tools is congestion charging. Singapore was first to implement congestion charging and during the last decade it was followed by London and Stockholm, with increasing support from the citizens as a consequence. Many other cities have performed feasibility studies for introduction of congestion charging. 

The development of transport models for prediction of demand management tools, such as congestion charging, has however not been able to keep up with this change in kind of policy. Transport models that were developed for prediction and evaluation of infrastructure investments, such as new motorways, are often used to forecast effects of policies aimed at managing demand, which too often results in poor prediction.

This thesis focuses on the needs for modelling of congestion charging. The state-of-practice models used before implementation in Singapore, London and Stockholm are reviewed, as well as more advanced dynamic models developed for prediction of congestion charging and other demand management tools. A number of gaps in the modelling of congestion charging are described and a new model called SILVESTER is developed, which closes some of these gaps. In particular, SILVESTER involves dynamic mesoscopic modelling of traffic flows, flexible departure times and users with heterogeneous preferences.

The thesis describes the implementation of SILVESTER and considers and compares different methods of demand aggregation in order to reduce run-time of the large-scale dynamic model (Paper I). It also describes how preferred departure times of road users can be determined in calibration such that consistency exists between the departure time choice model and dynamic traffic flows which are input to assignment (Paper II). The unique implementation of congestion charging in Stockholm gives the possibility to validate SILVESTER on real-world measurement of reductions in traffic flow and behavioural adjustments to the charges (Paper III). SILVESTER is then used to analyse several modified versions of the Stockholm congestion charging scheme and to compare welfare and equity effects of the different schemes. It is shown that the welfare of the current scheme could be improved if charges were allowed to differ by location and driving direction (Paper IV). It is shown that the benefits of congestion charges calculated using SILVESTER are greater than the benefits calculated with a static model. Finally, the reasons for the greater benefits are investigated (Paper V).

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. p. x, 59
Series
Trita-TEC-PHD, ISSN 1653-4468 ; 11:003
Keywords
Transport Modelling, Congestion Charging, Departure Time Choice, Dynamic Traffic Simulation, Welfare Effects, Equity
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-43732 (URN)978-91-85539-79-6 (ISBN)
Public defence
2011-11-09, F3, Lindstedsvägen 26, KTH, Stockholm, 10:30 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20111019Available from: 2011-10-19 Created: 2011-10-18 Last updated: 2012-06-12Bibliographically approved
Börjesson, M. & Kristoffersson, I. (2011). Estimating welfare effects of congestion charges in real world settings. Journal of Urban Economics
Open this publication in new window or tab >>Estimating welfare effects of congestion charges in real world settings
2011 (English)In: Journal of Urban Economics, ISSN 0094-1190, E-ISSN 1095-9068Article in journal (Other academic) Submitted
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:kth:diva-76797 (URN)
Note
TSC import 891 2012-02-06. QS 20120316Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2017-12-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3738-9318

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