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Wennström, Jonas
Publications (5 of 5) Show all publications
Wennström, J. & Karlsson, R. (2014). Possibilities to reduce pavement rehabilitation cost of a collision-free road investment using an LCCA design procedure. The international journal of pavement engineering, 17(4), 331-342
Open this publication in new window or tab >>Possibilities to reduce pavement rehabilitation cost of a collision-free road investment using an LCCA design procedure
2014 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 17, no 4, p. 331-342Article in journal (Refereed) Published
Abstract [en]

In the past decades, many single carriageway roads in Sweden have been converted to collision-free roads as a cost-effective alternative to conventional motorways. Investigations have concluded that the road type has been successful in reducing the number of fatal accidents, despite increased operation and maintenance costs. In recent years, the focus has shifted to converting narrower roads, which are anticipated to further increase pavement rehabilitation cost but also complicate traffic management during road works.

This paper first examines the consequences in terms of road agency and road user costs; second, the possibilities to influence future costs by design alternatives. A life cycle cost analysis was employed to study future costs. The analysis indicated significant increase in life cycle cost compared to a single carriageway road. The analysis of design alternatives also indicated that future agency and road user cost can be substantially improved by finding an optimal alternative.

Place, publisher, year, edition, pages
Taylor & Francis, 2014
Keywords
Life cycle, Cost, Maintenance, Rural road, Safety fence, Design (overall design), Alternative
National Category
Infrastructure Engineering
Research subject
00 Road: General works, surveys, comprehensive works, 02 Road: Economics; 70 Road: Maintenance
Identifiers
urn:nbn:se:vti:diva-9324 (URN)10.1080/10298436.2014.993191 (DOI)000366660100004 ()2-s2.0-84919940900 (Scopus ID)
Available from: 2016-09-15 Created: 2016-03-02 Last updated: 2017-11-21Bibliographically approved
Sjögren, L., Ihs, A., Edvardsson, K., Wennström, J., Haider, M., Casse, C., . . . Kreslin, M. (2013). Overall road asset performance.
Open this publication in new window or tab >>Overall road asset performance
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2013 (English)Report (Other academic)
Abstract [en]

The HeRoad project has investigated the road asset management situation and what practises exist to collect performance measurements in Europe. This has been done in a view from the operational level using a holistic perspective, in the sense that multiple assets and the cross relation between those are included. HeRoad’s approach by addressing the need for condition performance measurements can be justified with some words from (AASHTO, 2011); “What´s measured gets done; if you do not measure results, you cannot tell success from failure.” This implies that the view of investigation has been from the operational level more than from the strategic level (bottom–up).

Publisher
p. 128
Series
HeRoad ; D5
Keywords
Road network, Equipment, Pavement, Bridge, Tunnel
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design; 30 Road: Highway design, 33 Road: Surfacing; 30 Road: Highway design, 34 Road: Safety devices
Identifiers
urn:nbn:se:vti:diva-7863 (URN)
Projects
HeRoad - Holistic Evaluation of Road Assessment
Available from: 2015-05-26 Created: 2015-05-26 Last updated: 2016-02-03Bibliographically approved
Karlsson, R., Wennström, J. & Enocksson, C.-G. (2012). Follow-up study from a seven year performance contract ending in 2010. In: Kent Gustafson (Ed.), EPAM 2012: Malmö, Sweden, 5–7 September: 4th European pavement and asset management conference. Paper presented at EPAM 2012 - 4th European Pavement and Asset Management conference. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Follow-up study from a seven year performance contract ending in 2010
2012 (English)In: EPAM 2012: Malmö, Sweden, 5–7 September: 4th European pavement and asset management conference / [ed] Kent Gustafson, Linköping: Statens väg- och transportforskningsinstitut, 2012, , p. 11Conference paper, Published paper (Other academic)
Abstract [en]

The Swedish Transport Administration aims at improving procurement of road construction and maintenance to create incentives for contractors to develop their skills and efficiency. Introduction of performance requirements is believed to encourage new technical solutions that are more adapted to object specific situations. In order to develop procurement procedures for performance contracts, the Swedish Transport Administration has initiated a number of pilot projects. Pilot project Road N610 included design, construction, maintenance and operation of a new road. It was initiated in 1999 by developing procurement documents and finally opened for traffic in 2003. The bids were evaluated following laws of public procurement based on technical solution, price, organization, quality assurance and references. The winning bid scored about average in these categories. In 2010, the contract ended and the responsibility was handed over from the contractor to the road administration. The requirements were related to both pavement layers (wear resistance, durability, stability) and road surface (friction, rutting, evenness, cross fall, cracking and ravelling). To ensure the long term performance, a requirement was also employed on the road’s structural strength based on a falling weigh deflectometer index. A bonus-malus system was tied to the requirements. The pilot project has been monitored closely and reports have been issued from the development of procurement documents and from the procurement and construction phases. This paper report experience gained with emphasis on the technical outcome. Observations from the construction stage and data from verification of performance confirm that the contractor has taken necessary measures to meet requirements and consequently adapted the pavement design and construction during the whole contract period to minimize costs and risks. A number of issues are identified with respect to future improvements in procurement procedures. A major client risk in performance contracts is related to ensuring long term performance at acceptable costs for maintenance and to identify responsibilities for inferior performance.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2012. p. 11
Keywords
Contract, Performance, Pavement, Follow up study, Evaluation (assessment), Avtal, Prestanda, Överbyggnad, Uppföljningsstudier, Utvärdering
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design; 00 Road: General works, surveys, comprehensive works, 02 Road: Economics
Identifiers
urn:nbn:se:vti:diva-5302 (URN)978-91-637-1432-0 (ISBN)
Conference
EPAM 2012 - 4th European Pavement and Asset Management conference
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2016-02-25Bibliographically approved
Wennström, J. & Karlsson, R. (2012). Microsimulation of work zone delays and applications in pavement management. In: Kent Gustafson (Ed.), EPAM 2012: Malmö, Sweden, 5–7 September: 4th European pavement and asset management conference. Paper presented at EPAM 2012 - 4th European Pavement and Asset Management conference. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Microsimulation of work zone delays and applications in pavement management
2012 (English)In: EPAM 2012: Malmö, Sweden, 5–7 September: 4th European pavement and asset management conference / [ed] Kent Gustafson, Linköping: Statens väg- och transportforskningsinstitut, 2012, , p. 13Conference paper, Published paper (Other academic)
Abstract [en]

Operation and maintenance activities on roads will to a varying extent affect the traffic flow.Reduced speed limits past the work zones will cause some delays but the main impacts will occur when the road´s capacity is reduced in case of lane closures. This increases the probability of queues which may contribute to significant delays for the road users. Delays result in costs for the society. Additionally, queues increase fuel consumption, pollutants, risk for accidents as well as wearing of vehicles and roads.

This paper examines the use of microsimulation as a method to estimate the road user delays and discusses implementation issues and applications. The work zone delays have been implemented in a life-cycle cost analysis (LCCA) model. An LCCA was performed for the selection of wearing course type.

The key finding of this study is that the high level of detail gives the opportunity to model different work zone types, road types and speed limits using one method. In comparison to other methods, most which are specifically developed for work zone analysis, microsimulation has previously been used in numerous traffic capacity studies. This gives a certain confidence, in conjunction with performed calibrations and validations, that the results are valid. The performed LCCA indicated that the road user delay costs contribute to a significant share of the total life-cycle cost. The delay costs did therefore affect the selection of wearing course with respect to the estimated life-cycle costs.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2012. p. 13
Keywords
Work zone, Delay, Road closure, Traffic flow, Micro, Simulation, Life cycle, Cost, Vägarbetsplatser, Förseningar, Avstängning (vägar), Trafikflöde, Mikro, Simulering, Livscykel, Kostnader
National Category
Infrastructure Engineering
Research subject
70 Road: Maintenance; 20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
urn:nbn:se:vti:diva-5307 (URN)978-91-637-1432-0 (ISBN)
Conference
EPAM 2012 - 4th European Pavement and Asset Management conference
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2016-02-25Bibliographically approved
Karlsson, R. & Wennström, J. (2012). Uppföljning av väg N610: totalentreprenad med funktionellt helhetsåtagande under sju år. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Uppföljning av väg N610: totalentreprenad med funktionellt helhetsåtagande under sju år
2012 (Swedish)Report (Other academic)
Alternative title[en]
Follow-up study of a seven year design-build-operate-maintain project with performance requirements
Abstract [sv]

Rapporten sammanfattar och analyserar totalentreprenaden på väg N610, delen Brotorpet-Heagård, efter sju års kontraktstid. Objektet har följts upp från framtagandet av förfrågningsunderlag till och med trafiköppning. Objektet har även ingått som en del i IVA:s satsning på att utveckla upphandlingsformer. Denna rapport fokuserar på det tekniska utfallet under de sju år som funktionellt ansvar kontrakterats. Utfallet analyseras mot bakgrund av de förutsättningar som gavs i samband med upphandlingen, särskilt de funktionella kraven och utformningen av därtill kopplat bonus- och vitessystem.

Objektet är ett av ett fåtal objekt som på detta sätt följts upp så att idéer och resultat kan få spridning och användas i den utveckling av upphandlingsformer som måste äga rum. Särskilt viktigt är detta i ljuset av Trafikverkets pågående satsningar på totalentreprenader. Denna rapport bör läsas mot bakgrund av att branschen för tio år sedan hade ringa erfarenhet av totalentreprenader och objektet i stora delar kan betecknas som ett pilotprojekt där både beställare och entreprenör har lärt sig efter hand.

Ur både ett tekniskt och ekonomiskt perspektiv förefaller entreprenaden lyckad. Entreprenaden verkar inte ha blivit dyrare än vad som kan förväntas medan den tekniska prestandan är bra. Det konstateras att vissa mät- och verifieringsmetoder är behäftade med brister men att dessa brister inte på något avgörande sätt påverkat resultatet negativt.

Abstract [en]

This report concludes and analyses a Design-Build procurement on road N610, north of the city of Halmstad in Sweden, after a seven year contract period with performance requirements. This object has been followed up by others from the stage of preparing the procurement documents to the stage of opening the road for traffic. The object has also been part of the efforts of the Royal Swedish Academy of Engineering Sciences (IVA) efforts to facilitate development of procurement forms. This report focuses on the more technical aspects of the project, in particular the relationship between procurement design and the outcome in terms of measured technical parameters and the economical result of the bonus-malus system.

This project is one of few that have been followed up to document and share ideas and results in the current development of procurement forms so desperately needed. In Sweden, the project should also be used in the context of the substantial share of contracts today offered as Design-Build or even with extended responsibilities for maintenance or operations (performance contracts). Ten years ago, however, the experience was limited of these contracts and it is evident that this project has been a learning process for both contractor and client.

From a technical and economical point of view the project can be regarded as successful. The cost was normal and the technical outcome good, or even in some respect very good. Moreover, it can be concluded that there are requirements and measurement methods that are unreliable but this cannot be proven to have influenced the result in a negative way.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2012. p. 70
Series
VTI rapport, ISSN 0347-6030 ; 740
Keywords
Road construction, Contract, Pavement, Performance, Durability, Cost, Condition survey, Follow up study, Vägbyggnad, Avtal, Överbyggnad, Prestanda, Hållbarhet, Kostnader, Tillståndsbedömning, Uppföljningsstudier
National Category
Infrastructure Engineering
Research subject
Road: Highway design, Road: Pavement design; Road: General works, surveys, comprehensive works, Road: Economics
Identifiers
urn:nbn:se:vti:diva-1822 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2016-02-25Bibliographically approved
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