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  • Mobility and traffic research  (5)
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  • Mobility and traffic research  (5)
  • 1
    Online Resource
    Online Resource
    Errors in Analyses for Capacity and Timing Design of Signalized Intersections in Absence of Steady Queue Discharge Rates
    SAGE Publications ; 2007
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2027, No. 1 ( 2007-01), p. 85-90
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2027, No. 1 ( 2007-01), p. 85-90
    Abstract: Many models for the analysis of capacity and signal timing of signalized intersections are based on the assumption that queue discharge will quickly reach a steady maximum rate after the green interval begins. This assumption leads to a common practice of using saturation flow and lost time as parameters in modeling the requirements for lane capacity, intersection performance, and signal timing. However, recent field data indicate that the queue discharge rate may continue to increase long after green onset. For this type of queue discharge characteristic, the traditional applications of lost time and saturation flow may result in significant errors when lane capacity and modeling optimal cycle length are estimated. The extent of such errors is assessed on the basis of the queue discharge characteristics observed in 38 urban traffic lanes.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2027-11
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2007
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Capacity and Other Traffic Characteristics in Taiwan's 12.9-km-Long Shea-San Tunnel
    SAGE Publications ; 2009
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2130, No. 1 ( 2009-01), p. 101-108
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2130, No. 1 ( 2009-01), p. 101-108
    Abstract: The 12.9-km-long Shea-San Tunnel, located on Taiwan's 54-km-long National Highway 5 (NH-5), has two one-way tubes. To minimize accidents and to respond to the need for improved operating efficiency on NH-5, Taiwan's Bureau of National Highways adopts a graduated approach in traffic control. Before October 2007, the bureau set a uniform speed limit of 70 kilometers per hour (km/h) for NH-5 and allowed only passenger cars and other small vehicles to enter the Shea-San Tunnel and the adjacent Pern-San Tunnel. With the exception of the Shea-San Tunnel, the speed limit was raised to 80 km/h in October 2007. In November 2007, the bureau opened all the tunnels to commercial buses and, most recently, the bureau raised the speed limit in the Shea-San Tunnel to 80 km/h. One traffic regulation that remains unchanged is that motorists in the Shea-San Tunnel must maintain a minimum car-following distance of 50 m under normal conditions. The capacities of the two tubes in the Shea-San Tunnel are still low. This study uses detector data to examine the spatial and temporal variations of capacity, free-flow speed, passenger car equivalents of buses, and speed–flow relationship.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2130-13
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2009
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Calculation of Lateral Stability of Tank Trucks and its Relationship with Filling Rate
    SAGE Publications ; 2024
    In:  Transportation Research Record: Journal of the Transportation Research Board
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications
    Abstract: To investigate a theoretical algorithm model of the lateral stability of tank trucks and its relationship with the liquid filling rate, the shifting of the liquid centroid during non-full loading is considered. The deformation of the suspension and tires under load is assumed to exhibit a linear relationship. Using the principle of moment balance, a calculation model for the maximum stable roll angle and rollover critical acceleration of tank trucks based on the “liquid–tank–vehicle” tri-coupling is established, and the relationship between the maximum stable roll angle and rollover critical acceleration of tank trucks is analyzed and compared. Based on the result and a specific tank truck model, the effects of the liquid filling rate on the maximum stable roll angle, rollover critical acceleration, and tank tilt angle of tank trucks are investigated using numerical analysis methods. A comparison with the lateral stability of ordinary trucks loaded with solid goods is performed to further examine the effect of the liquid filling rate on the lateral stability of tank trucks. The results show that the maximum stable roll angle and rollover critical acceleration are consistent indicators for evaluating the lateral stability of tank trucks; the lateral stability of tank trucks decreases owing to the shift in the liquid centroid inside the tank; as the liquid filling rate increases, the lateral stability of the tank trucks deteriorates slightly.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981241233298
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2024
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Variations in Queue Discharge Patterns and Their Implications in Analysis of Signalized Intersections
    SAGE Publications ; 2004
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 1883, No. 1 ( 2004-01), p. 192-197
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 1883, No. 1 ( 2004-01), p. 192-197
    Abstract: Saturation flow is traditionally treated as a stabilized maximum rate at which queuing vehicles can be discharged from a lane after the signal changes to green. Traffic engineers in many countries have been using this parameter to estimate the capacities of traffic lanes at signalized intersections. The estimated capacities in turn are used to estimate other performance measures and to classify levels of service. This traditional method of analysis is an efficient way for capacity estimation if the queue discharge rate rises quickly to a steady maximum after onset of the green signal. Actual queue discharge patterns, however, often do not display an easily identifiable steady maximum rate. This characteristic renders the use of saturation flow troublesome and prone to errors that can lead to poor planning and operational decisions. The pitfalls in the current use of saturation flow are examined, and ways of alleviating the problems are suggested.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/1883-22
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2004
    detail.hit.zdb_id: 2403378-9
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  • 5
    Online Resource
    Online Resource
    Synthesis Strategy and Basic Validation of Recyclable Epoxy Asphalt
    SAGE Publications ; 2023
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2677, No. 9 ( 2023-09), p. 69-80
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2677, No. 9 ( 2023-09), p. 69-80
    Abstract: The inefficient regeneration of epoxy asphalt is an increasingly serious problem that has greatly restricted its application and development. To alleviate this severe difficulty, recyclable epoxy asphalt has been designed on the basis of the reversibility of dynamic covalent bonds, taking into consideration its nonrenewable characteristics. The synthesis strategy and basic validation of recyclable epoxy asphalt were therefore preliminarily implemented in this study. According to the screening of reversible covalent bond-forming reactions (Diels–Alder reaction), the design scheme of recyclable epoxy asphalt was first proposed. Then the preparation and regeneration processes of recyclable epoxy asphalt were designed and adjusted to give a series of optimal solutions. Finally, samples of recyclable epoxy asphalt and conventional epoxy asphalt were analyzed and tested microscopically before and after regeneration. In comparison with conventional epoxy asphalt, recyclable epoxy asphalt exhibited outstanding sustainability and damping characteristics. Moreover, the damping characteristics of recyclable epoxy asphalt after regeneration were still better than those of conventional epoxy asphalt, which indicated that recyclable epoxy asphalt displayed promising performance. According to the regeneration efficiency, it can be concluded that recyclable epoxy asphalt was successfully prepared. However, mechanical properties of recyclable epoxy asphalt still need to be optimized from the perspective of the proportions of materials.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981231158315
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2403378-9
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