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  • 2010-2014  (41)
  • Mobilitäts- und Verkehrsforschung  (41)
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  • 2010-2014  (41)
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  • Mobilitäts- und Verkehrsforschung  (41)
  • 1
    Online-Ressource
    Online-Ressource
    U.S. Postal Airmail Routing Optimization
    SAGE Publications ; 2013
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2334, No. 1 ( 2013-01), p. 21-28
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2334, No. 1 ( 2013-01), p. 21-28
    Kurzfassung: An airmail routing problem at the United States Postal Service (USPS) is studied in this paper. Each day, millions of airmails of different priorities are collected and shipped between local USPS mail processing and distribution centers (P & DCs) by commercial air carriers. The carriers provide flight capacities and services according to contracts. Each available flight has a finite, maximum capacity for the airmails. In addition, the shipping between P & DCs incurs a cost that is determined by the type of mail, the volume, and the shipping distance. The research objective is to decide airmail allocation onto flights subject to the agreed-on air capacity to minimize system shipping costs while maintaining service quality. An integrated mathematical model is developed to design air routes and to allocate airmails optimally to routes for an improvement on the practice of isolated scheduling at each P & DC. A column generation method is proposed for the model. A numerical test is conducted with operational data. The test not only shows a significant increase in the total volume that can be shipped but also indicates better service in terms of on-time and early deliveries.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2334-03
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2013
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Addressing Deficiencies in the Highway Capacity Manual Bike Level of Service Model for Arterial Roadways
    SAGE Publications ; 2014
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2461, No. 1 ( 2014-01), p. 32-40
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2461, No. 1 ( 2014-01), p. 32-40
    Kurzfassung: The Highway Capacity Manual 2010 (HCM) includes methodologies for calculating the segment- and facility-level bicycle level of service (LOS) as part of a multimodal LOS analysis. Practitioners have found that, in many cases, the HCM methodology does not provide intuitive results. The HCM methodology produces scores that represent a roadway as worse than it actually is, does not provide enough sensitivity to bike facility improvements, and does not provide an adequate range of results. It is difficult to achieve an A or B LOS score with the HCM methodology. The addition of bike lanes does not have a significant impact on the LOS. It is also difficult to achieve an LOS worse than E, regardless of how poor bicycling conditions are. This paper describes an effort by the Florida Department of Transportation to create an alternative model that more accurately represents how well roadways meet the needs of bicyclists. The model is based on the time exposed and relative LOS value for each individual LOS component (intersection, link). The model was developed with the input of a panel of practitioners from around the country. The resulting model represents an LOS methodology that provides more intuitive values (than the HCM methodology) for those evaluating roadway networks. This paper provides recommended changes to the bicycle LOS methodology in the HCM chapters on urban streets.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2461-05
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2014
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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    BTU Cottbus
  • 3
    Online-Ressource
    Online-Ressource
    Analysis of Fuel Ethanol Transportation Activity and Potential Distribution Constraints
    SAGE Publications ; 2010
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2168, No. 1 ( 2010-01), p. 136-145
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2168, No. 1 ( 2010-01), p. 136-145
    Kurzfassung: An analysis is provided of fuel ethanol transportation activity and potential distribution constraints if the total 36 billion gal of renewable fuel use by 2022 is mandated by the U.S. Environmental Protection Agency (EPA) under the Energy Independence and Security Act of 2007. Ethanol transport by domestic truck, marine, and rail distribution systems from ethanol refineries to blending terminals is estimated with the Oak Ridge National Laboratory's North American infrastructure network model. Most supply and demand data provided by EPA were geocoded, and the transportation infrastructure network was updated through use of available commercial sources. The percentage increases in ton-mile movements by rail, waterways, and highways in 2022 are estimated to be 2.8%, 0.6%, and 0.13%, respectively, compared with the corresponding 2005 total domestic flows by various modes. Overall, a significantly higher level of future ethanol demand would have a minimal impact on the transportation infrastructure. However, there will be spatial impacts, and a significant level of investment will be needed because of a considerable increase in rail traffic from refineries to ethanol distribution terminals.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2168-16
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2010
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 4
    Online-Ressource
    Online-Ressource
    Analytical Models for Protected plus Permitted Left-Turn Capacity at Signalized Intersection with Heavy Traffic
    SAGE Publications ; 2010
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2192, No. 1 ( 2010-01), p. 177-184
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2192, No. 1 ( 2010-01), p. 177-184
    Kurzfassung: This paper presents theoretical analysis of left-turn operations under heavy traffic. When traffic demand is heavy, residual queues from previous cycles may occur and contribute to blockage of the left-turn bay by adjacent through traffic. Such blockage reduces the left-turn capacity and is a random phenomenon. An improved model for protected left-turn capacity is first proposed, taking into account the influence of residual queues and blockage by through traffic. In addition, the classic model always overestimates the potential permitted left-turn capacity when opposing traffic is heavy. The potential permitted left-turn capacity is then modeled in a probabilistic way, and a simple estimation is suggested by investigating its relation to the classic model. Furthermore, because left-turn capacity may vary in response to a blockage, the coefficients of variance for protected left-turn capacity and for queue clearance time are introduced to evaluate the protected left-turn timing plan. The developed analytical models are validated with CORSIM simulations.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2192-17
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2010
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
    Open Access Wunsch
    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 5
    Online-Ressource
    Online-Ressource
    Identification and Tracking of Highway Bridge Maintenance
    SAGE Publications ; 2011
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2220, No. 1 ( 2011-01), p. 12-20
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2220, No. 1 ( 2011-01), p. 12-20
    Kurzfassung: An overview of practices for highway bridge maintenance of state transportation departments (DOTs) in the United States is presented. DOT practices are given in the areas of identification of maintenance needs, numbering systems for maintenance actions, performance and priority measures related to maintenance, and data systems engaged by maintenance. The overview finds that DOTs have similar work procedures for identification and tracking of maintenance needs and somewhat similar approaches to performance and priority measures, but dissimilar practices in numbering systems for maintenance actions. Most DOTs use one or more individualized data systems to track maintenance work, monitor network-level performance, and evaluate maintenance work plans. The information presented is one product of studies of bridge maintenance decision making and bridge database development.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2220-02
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2011
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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    Verfügbarkeit (elektronisch / print)
    BTU Cottbus
  • 6
    Online-Ressource
    Online-Ressource
    Dispatch Problem of Automated Guided Vehicles for Serving Tandem Lift Quay Crane
    SAGE Publications ; 2012
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2273, No. 1 ( 2012-01), p. 79-86
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2273, No. 1 ( 2012-01), p. 79-86
    Kurzfassung: New quay cranes (QCs) have been designed to increase terminal productivity by lifting more containers simultaneously. But QC productivity relies on efficient cooperation with the vehicles carrying the containers. This paper investigates the synchronization scheduling problem between the automated guided vehicles and these new QCs. The problem is formulated as a mixed integer linear programming model. Because of the problem's complexity, a heuristic dispatch rule is proposed for practical purposes. Then, to balance the computation time and the quality of the solution, a neighborhood search method is designed by investigating the working sequences of automated guided vehicles. Numerical experiments show that both heuristics obtain good solutions within extremely short times and that the neighborhood search method generally performs better in relation to the objective value.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2273-10
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2012
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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  • 7
    Online-Ressource
    Online-Ressource
    Modeling Maintenance Project Selection on a Multimodal Transportation Network
    SAGE Publications ; 2014
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2409, No. 1 ( 2014-01), p. 1-8
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2409, No. 1 ( 2014-01), p. 1-8
    Kurzfassung: The selection of maintenance projects that require funding is essential to the well-being of the waterway transportation system. This paper develops optimization models and heuristics to maximize the benefits of the maintenance projects selected for funding in a multimodal transportation network. This paper includes a mixed linear integer model to maximize the overall network capacity while allowing for partial funding of each project. The model is further extended to account for the random nature of shoaling and subsequent vessel draft restrictions after dredging to maximize the expected capacity over a multiyear study period. In addition, two heuristics are proposed to provide approximate solutions efficiently. All the models and heuristics are tested on real network examples.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2409-01
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2014
    ZDB Id: 2403378-9
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  • 8
    Online-Ressource
    Online-Ressource
    Anxiety-Based Formulation to Estimate Generalized Cost of Transit Travel Time
    SAGE Publications ; 2010
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2143, No. 1 ( 2010-01), p. 108-116
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2143, No. 1 ( 2010-01), p. 108-116
    Kurzfassung: This paper examines the effect of unreliable transit service on transit user costs with the goal of increasing the accuracy of mode choice models. The concept advanced here is to include explicitly in the formulation of mode choice models the anxiety experienced by passengers when service is unreliable because of late departure or longer-than-expected in-vehicle travel time. This anxiety is modeled as a generalized cost penalty that is added to actual in-vehicle time. The magnitude of the penalty depends on travelers’ assessment of the likelihood of arriving on time at their destination. It is believed that this formulation of anxiety is behaviorally representative. To test the effects of the formulation, a simulation model is generated that quantifies the anxiety component of generalized cost for 10,000 travelers with various aversions to risk for travel between station pairs with different observed reliabilities. Results suggest that primarily for risk-averse travelers, but also for other classes, anxiety may constitute a high percentage of total generalized cost, which may explain many travelers’ unwillingness to choose transit in cases in which deterministic models suggest that they will. Calibrating a model of this type presents substantial challenges. An approach is introduced that is currently being pursued to gather actual anxiety levels as a function of transit travel reliability. The paper concludes with comments on future research directions.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2143-14
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2010
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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  • 9
    Online-Ressource
    Online-Ressource
    Surface Energy Characteristics and Impact of Natural Minerals on Aggregate–Bitumen Bond Strengths and Asphalt Mixture Durability
    SAGE Publications ; 2012
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2267, No. 1 ( 2012-01), p. 45-55
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2267, No. 1 ( 2012-01), p. 45-55
    Kurzfassung: The surface free energy of a solid is a material property that influences its interaction with other solids, liquids, and gases. Mineral aggregates are mixed with bitumen in the production of asphalt mixtures, and the interaction of aggregates with bitumen, water, or chemical modifiers affects the overall performance of the mixtures and, in turn, the pavement structure. A comprehensive characterization of the minerals that make up these aggregates can be used to explain the interactions between the aggregates and components used to bind the aggregates including bitumen, water, and chemical additives. This paper combines several techniques to quantify and describe or catalog mineral properties. These properties primarily include surface free energy, specific surface area, and surface carbon content of some of the most common minerals found in aggregates. The paper presents data that exemplify how this information can be used to characterize the moisture-induced stripping potential for bitumen–mineral combinations. Results indicate that a simple energy ratio calculated on the basis of adhesive bond energies from surface free energy measurements of the minerals and the bitumen can predict performance in asphalt mixtures and that a few minerals can form thermodynamically stable bonds with some bitumens that are inherently resistant to stripping.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2267-05
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2012
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Online-Ressource
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  • 10
    Online-Ressource
    Online-Ressource
    Estimating Signalized Intersection Delays to Transit Vehicles : Using Archived Data from Automatic Vehicle Location and Passenger Counting Systems
    SAGE Publications ; 2011
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2259, No. 1 ( 2011-01), p. 158-167
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2259, No. 1 ( 2011-01), p. 158-167
    Kurzfassung: Many transit agencies have deployed automatic vehicle location (AVL) systems, automatic passenger counting (APC) systems, or both on a portion of their transit vehicle fleets. Data from these systems are used for realtime system monitoring and control, and archived data are often used for service performance reporting and for service planning. This paper proposes and demonstrates a method by which these archived data can be used to estimate the mean and variance of transit vehicle delays caused by signalized intersections. The proposed method is suitable for application to most transit AVL-APC databases and is demonstrated with data from Grand River Transit, the public transit service provider in the region of Waterloo, Ontario, Canada. The results obtained from the application to field data indicated that the proposed method was able to explain 96% of the variation in observed mean transit vehicle delay at signalized intersections. These results suggest that the proposed method has practical application for the identification and prioritization of candidate measures for transit priority, including transit signal priority (green extension, early green, special transit phases) and queue jump lanes.
    Materialart: Online-Ressource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2259-15
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2011
    ZDB Id: 2403378-9
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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