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  • 1.
    Karim, Hawzheen
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Vägteknik.
    Alam, Moudud
    Högskolan Dalarna, Akademin Industri och samhälle, Statistik.
    Magnusson, Rolf
    Högskolan Dalarna, Akademin Industri och samhälle, Vägteknik.
    Road barrier repair costs and influencing factors2011Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 137, nr 5, s. 349-359Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a study that examines repair costs for different road barrier types and factors that influence these costs. The analyses focused on w-beam and cable barriers used as median barriers. To some extent, pipe barriers, Kohlswa-beam barriers, and concrete barriers were also studied. The influencing factors included in this study were road type, speed limit, barrier type, and seasonal effects. A case study was conducted in four regions of the Swedish Road Administration. Data were collected from 1,625 barrier repairs carried out during 2005 and 2006. The results show that the number of barrier repairs and the average repair cost per vehicle kilometer are higher along collision-free roads than along motorways and 4-lane roads. The results also show that the number of barrier repairs and the average repair cost per vehicle kilometer are higher for cable barrier than for other barrier types. No conclusion can be drawn regarding influence of speed limits on barrier repairs and associated costs as the result from the regions are divergent and not statistically significant. DOI: 10.1061/(ASCE)TE.1943-5436.0000227. (C) 2011 American Society of Civil Engineers.

  • 2.
    Karim, Hawzheen
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Vägteknik. KTH.
    Magnusson, Rolf
    Högskolan Dalarna, Akademin Industri och samhälle, Vägteknik.
    Natanaelsson, Kenneth
    Life-cycle cost analyses for road barriers2011Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 138, nr 7, s. 830-851Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study aimed at applying and evaluating a new approach for analyzing life-cycle costs for road components during the road planning and design process. Road median barriers were chosen as an example. The approach is based on a method called “Activity-Based Life-Cycle Costing using the Monte Carlo Simulation” for managing future costs and the associated risks. The results show a potential for increasing efficiency throughout the road planning and design process by minimizing the life-cycle costs of road components. The results also show that implementation of life-cycle cost analyses in the road planning and design process is possible, but difficult, mainly due to lack of relevant data.

  • 3. Offrell, P
    et al.
    Sjögren, L
    Magnusson, Rolf
    Högskolan Dalarna, Akademin Industri och samhälle, Vägteknik.
    Repeatability in crack data collection on flexible pavements: comparison between surveys using video cameras, laser cameras and a simplified manual Survey2005Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 131, nr 7, s. 552-562Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Crack data can be collected using manual or automatic surveys. Traditionally, manual methods are used, and they are still the most common. Changing into automatic systems will enhance the efficiency of data collection as well as the objectivity. In this study the repeatability of an automatic crack data collection system using video images was evaluated. Ten repetitive measurements were made on a 10-km-long road section. Cracking was measured using six laser cameras attached to the same vehicle. The results from the two methods were compared. Simultaneously, a simplified manual windshield survey was conducted by three different persons, and the repeatability obtained was used for comparison with the repeatability established using the image and laser method, respectively. The correlation between repeated measurements using the two automatic systems was high, while the repeatability for the manual, subjective method was low. Suitable measures for crack characterization are discussed.

  • 4. Onar, Arzu
    et al.
    Thomas, Fridtjof
    Choubane, Bouzid
    Statistical Mixed Effects Models for Evaluation and Predication of Accelerated Pavement Testing Results2006Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 132, nr 10, s. 771-780Artikkel i tidsskrift (Fagfellevurdert)
  • 5.
    Svenson, Kristin
    Högskolan Dalarna, Akademin Industri och samhälle, Statistik.
    Estimated lifetimes of road pavements in Sweden using time-to-event analysis2014Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 140, nr 11, artikkel-id 04014056Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Maintenance planning of road pavement requires reliable estimates of roads' lifetimes. In determining the lifetime of a road, this study combines maintenance activities and road condition measurements. The scope of the paper is to estimate lifetimes of road pavements in Sweden with time-to-event analysis. The model is stratified according to traffic load and includes effects of pavement type, road type, bearing capacity, road width, speed limit, stone size, and climate zone. Among the nine analyzed pavement types, stone mastic had the longest expected lifetime with a hazard ratio (risk of needing maintenance) estimated to be 36% lower than asphalt concrete. Among road types, 2+1 roads had 22% higher hazard ratio than ordinary roads indicating significantly lower lifetimes. Increased speed lowered the lifetime, while increased stone size (up to 20 mm) and increased road width lengthened the lifetime. The results are of importance for life-cycle cost analysis and road management. (C) 2014 American Society of Civil Engineers.

  • 6. Thomas, Fridtjof
    Automated Road Segmentation Using a Bayesian Algorithm2005Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 131, nr 8, s. 591-598Artikkel i tidsskrift (Fagfellevurdert)
  • 7.
    Thomas, Fridtjof
    Högskolan Dalarna, Akademin Industri och samhälle, Statistik.
    Statistical Approach to Road Segmentation2003Inngår i: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 129, nr 3, s. 300-308Artikkel i tidsskrift (Fagfellevurdert)
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