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  • Mobility and traffic research  (5)
  • 1
    Online Resource
    Online Resource
    Hierarchical Network Model of Safe High-Speed Rail Operation
    SAGE Publications ; 2011
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2261, No. 1 ( 2011-01), p. 49-56
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2261, No. 1 ( 2011-01), p. 49-56
    Abstract: This paper presents a preliminary hierarchical network model based on an analysis of the interaction of relationships between operating safety factors of high-speed rail (HSR). The model is based on the characteristics and factors specific to HSR operation and aims to provide a new theory and method for assessing the safety of HSR operation with the use of the relationship analysis methods of a hierarchical network model. A comprehensive theory of safety assessment in HSR operations is necessary for HSR designers and operators to consider rail safety pro-actively rather than passively. The development and the application of such a broad-ranging safety assessment theory for HSR operation could help to guarantee efficient HSR operation by protecting the safety of passengers, reducing losses, maintaining social stability, and improving economic efficiency.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2261-06
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
    detail.hit.zdb_id: 190260-X
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Influence of Internal and External Pressure Sensing on Green Travel Intention: Based on a Theoretical Model of the Theory of Planned Behavior and Pressure-state-response Model
    SAGE Publications ; 2023
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2677, No. 2 ( 2023-02), p. 958-972
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2677, No. 2 ( 2023-02), p. 958-972
    Abstract: Factors that affect environmentally sustainable travel behavior (or “green travel”) and their mechanisms of action are important to understand to conserve energy and reduce emissions. We constructed a model by integrating the theory of planned behavior (TPB) and the pressure-state-response (PSR) model with individual cognition of green travel policies (external pressure) and sensitivity of environmental problems (internal pressure). Then, an empirical study of 796 urban residents in eastern China was conducted. The results show that, with regard to the TPB, attitude has a direct and significant impact on self-practiced and interpersonal intentions, while perceived behavior control has a similar effect on self-practiced green travel intentions. Further, our results also indicate that subjective norms have indirect influence on both self-practiced and interpersonal intentions by affecting attitudes. With regard to the PSR model, urban residents’ cognitions of external and internal pressures affect their green travel intentions in various ways. Based on the results, some relevant policy recommendations aimed at promoting green travel are proposed.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981221110227
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 190260-X
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Application of Bus-Only Lanes in Downtown Washington, D.C.: Concurrent Versus Contraflow Bus Lanes
    SAGE Publications ; 2016
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2539, No. 1 ( 2016-01), p. 119-129
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2539, No. 1 ( 2016-01), p. 119-129
    Abstract: Buses operating in mixed traffic are subject to congestion and thus experience long delays and unreliable service. The impact of congestion on buses is more pronounced in downtown areas than elsewhere because of heavy vehicular traffic, high transit–pedestrian activity, and friction caused by curbside users. This research explored potential benefits, effects, and costs associated with bus-only lane alternatives, including effects for traffic, transit, and curbside users (e.g., parking and loading). H and I Streets, Northwest, in downtown Washington, D.C., where bus frequency reaches one every minute during peak hours, were modeled through microsimulation. Concurrent-flow lanes and contraflow bus-only lanes were analyzed. A benefit–cost analysis (BCA) was conducted for each scenario of bus-only lanes. Concurrent-flow bus-only lanes (Alternative 1) offered a low-cost solution with good benefits (reduction as high as 5 min/mi in bus travel time). However, sensitivity analysis showed that enforcement of restrictions on right turns and operations would be needed to ensure these benefits. A contraflow bus-only lane on H Street (Alternative 2) provided substantial improvements in auto and transit travel times without right-turn restrictions and with medium costs. As a result, Alternative 2 provided the most monetary benefits, according to the BCA, with a benefit–cost ratio of 28. Benefits associated with contraflow bus lanes were not contingent on enforcement, because they are self-enforcing. Couplet contraflow bus-only lanes on H and I Streets (Alternative 3) represented the highest-cost solution yet resulted in marginal benefits compared with the other scenarios because of its high impact on auto users.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2539-14
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 190260-X
    detail.hit.zdb_id: 2403378-9
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  • 4
    Online Resource
    Online Resource
    Control Design, Stability Analysis, and Traffic Flow Implications for Cooperative Adaptive Cruise Control Systems with Compensation of Communication Delay
    SAGE Publications ; 2020
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2674, No. 8 ( 2020-08), p. 638-652
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2674, No. 8 ( 2020-08), p. 638-652
    Abstract: Communication delay is detrimental to the performance of cooperative adaptive cruise control (CACC) systems. In this paper, we incorporate communication delay explicitly into control design and propose a delay-compensating CACC. In this new CACC system, the semi-constant time gap (Semi-CTG) policy, which is modified on the basis of the widely-used CTG policy, is employed by a linear feedback control law to regulate the spacing error. The semi-CTG policy uses historical information of the predecessor instead of its current information. By doing so, communication delay is fully compensated, which leads to better stability performance. Three stability properties—local stability, string stability, and traffic flow stability—are analyzed. The local stability and string stability of the proposed CACC system are guaranteed with the desired time gap as small as the communication delay. Both theoretical analysis and simulation results show that the delay-compensating CACC has better string stability and traffic flow stability than the widely-used CACC system. Furthermore, the proposed CACC system also shows the potential for improving traffic throughput and fuel efficiency. Robustness of the proposed system against uncertainties of sensor delay and vehicle dynamics is also verified with simulation.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198120918873
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 190260-X
    detail.hit.zdb_id: 2403378-9
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    Online Resource
  • 5
    Online Resource
    Online Resource
    An optimization Model Combining Operator-Based Relocation With User-Based Relocation for Electric Carsharing Systems
    SAGE Publications ; 2022
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2676, No. 12 ( 2022-12), p. 827-846
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2676, No. 12 ( 2022-12), p. 827-846
    Abstract: This paper proposes an optimization model combining operator-based relocation with user-based relocation for electric carsharing systems, aiming to improve the low usage of vehicles and the imbalance between supply and demand. First, the back-propagation neural network prediction model of vehicle quantity demand and the distribution fitting model of energy demand are constructed. In the operator-based scheme, optimization models of inter-regional and intra-regional relocation are constructed. In the user-based scheme, a multi-objective optimization model considering the operator profit and user experience is proposed. Taking the actual operation data of an electric carsharing company in Shanghai as an example, the mixed scheduling strategy of operator-based relocation and user-based relocation is validated. Results show that: (i) users are very sensitive to price changes, and station distance and price incentive will change users’ pickup and return behavior; (ii) compared with systems without vehicle relocation, the mixed scheduling strategy can reduce the using failure rate by 6.68% and increase net profit by 42.6% in the best situation; and (iii) the using-failure rate alert line, as a switching mechanism between user-based and operator-based relocation, can play a regulatory role, and with the loosening of the alert line, the frequency of operator-based relocation intervention increases, and the using-failure rate decreases further.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981221097963
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 190260-X
    detail.hit.zdb_id: 2403378-9
    Location Call Number Limitation Availability
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    Online Resource
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