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  • Online Resource  (3)
  • Mobility and traffic research  (3)
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  • Online Resource  (3)
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  • Mobility and traffic research  (3)
  • 1
    Online Resource
    Online Resource
    Development of Operating Mode Distribution Models for Light-Duty Vehicles on Unrestricted Access Roadways
    SAGE Publications ; 2020
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2674, No. 10 ( 2020-10), p. 416-428
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2674, No. 10 ( 2020-10), p. 416-428
    Abstract: The key correlating traffic variable for modeling vehicle emissions has evolved from average speed to vehicle-specific power (VSP), and recently to operating mode as defined in Motor Vehicle Emission Simulator (MOVES). The analysis of operating mode and its distribution, however, requires a large amount of data and is time consuming and challenging. This paper attempts to build models between the operating mode distributions and the common traffic variable—average speed—to facilitate the emission estimation. Focusing on light-duty vehicles and unrestricted access roadways, a floating car survey was conducted separately on arterials and collectors in Shaoshan, China. The trajectory data were processed to reveal the characteristics of operating mode distributions. A key finding is that, when the data points of the operating mode of idle are excluded, the VSP distributions of the remaining data points follow logistic distributions and the parameters can be linearly regressed with the average speed. Arterials and collectors feature different operating mode distributions even at the same average speed, and therefore different models were developed. The models were then applied to generate operating mode distributions, which were validated with the real-world data from the test bed and which, when compared with the default values generated by MOVES, fit the real-world condition better.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198120937965
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Evaluation of Pavement Treatment Strategies for Friction-Deficient Horizontal Curves
    SAGE Publications ; 2022
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2676, No. 6 ( 2022-06), p. 476-487
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2676, No. 6 ( 2022-06), p. 476-487
    Abstract: In friction management of horizontal-curve pavements, highway agencies develop treatment strategies for friction-deficient pavements mainly based on past experience or industry recommended practices. In the absence of an engineering procedure to evaluate the effectiveness of friction treatments, there is no sound basis for comparing the effectiveness of different treatment strategies. To overcome this limitation, this study explored a mechanistic approach to analyze friction treatments for a horizontal curve and compare the magnitudes of skid resistance improvement, reductions of skidding potential, and terminal polished skid resistance. This was achieved by applying the finite element simulation technique to calculate the tire–pavement skid resistance available and the safe vehicle speeds under a given set of design operating conditions. For illustration, five friction treatments for pavement curves were analyzed: resurfacing/overlay, high-friction resurfacing, longitudinal grooving, transverse grooving, and resurfacing/overlay plus raising of superelevation. The skid resistance, safe vehicle speed, and terminal skid resistance were determined for different wet-weather operating conditions. The operating conditions were defined by horizontal-curve geometric parameters, pavement surface properties, wheel load, geometric and structural properties of tire, and water film thickness. The effectiveness of an improvement treatment is evaluated by skid resistance improvement, skidding potential reduction, and terminal polished skid resistance. Two quantitative indicators were introduced for effectiveness evaluation: safe skid resistance margin ΔSN and safe vehicle speed margin ΔV. The proposed approach presents a quantitative engineering assessment procedure for highway agencies in the selection of a suitable treatment, and maintenance planning in their friction management of horizontal-curve pavements.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981221075020
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2403378-9
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  • 3
    Online Resource
    Online Resource
    Right-Turn-on-Red Flow Profile Impacts on Urban Street Capacity Analysis
    SAGE Publications ; 2016
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2553, No. 1 ( 2016-01), p. 29-40
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2553, No. 1 ( 2016-01), p. 29-40
    Abstract: The Highway Capacity Manual 2010 (HCM 2010) contains computational procedures for evaluating traffic operational efficiency of urban street segments. These procedures have been implemented within several commercial software packages and are likely used by thousands of engineers and planners across the United States. The procedures for urban street capacity analysis contain no logic for handling right turns on red (RTORs) or for handling special cases of RTORs such as shielded and free right turns. A new proposed RTOR modeling framework is described for urban streets in the HCM 2010. When significant upstream RTOR flows exist, the proposed logic is designed to generate more realistic flow profiles. Three types of experimental results are presented: they demonstrate the improved modeling accuracy of the proposed logic. First, it is shown that macroscopic flow profile shapes are now more visually sensible because they now illustrate RTOR flows moving at the appropriate times. Second, macroscopic flow profile shapes are now more consistent with microscopic vehicle trajectories. Third, a statistical analysis shows that when the proposed logic is used, HCM 2010 performance measures become more consistent with the performance measures generated by microsimulation. Finally, case study results show that when the proposed RTOR logic is not used, control delays are sometimes be inaccurate by more than 30%. Given the experimental evidence presented, it is urgent that the proposed improvements be adopted and implemented so that RTOR corridors can be accurately analyzed by the HCM 2010 procedures.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2553-04
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2403378-9
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