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  • Mobility and traffic research  (10)
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  • Mobility and traffic research  (10)
  • 1
    Online Resource
    Online Resource
    Design of a Dual-Modal Signal Progression Model for Urban Arterials Accommodating Heavy Transit and Passenger Car Flows
    SAGE Publications ; 2019
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2673, No. 10 ( 2019-10), p. 1-13
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2673, No. 10 ( 2019-10), p. 1-13
    Abstract: Despite extensive studies aiming at contending with congestion on urban arterials, an effective model to produce optimal signal progression for an arterial experiencing heavy bus and passenger car flows remains unavailable. In response to such needs, this study presents a bandwidth maximization model that can offer concurrent progression to both modes or to a selected mode(s) in a selected direction(s), based on traffic volume, bus ratio, and geometric conditions. To capture the operational features of both modes, the proposed model has effectively taken into account all critical issues that may result in mutual impedance between them, which include the potential blockage by passenger car queues of roadside bus stops, the excessive start-up delays caused by transit vehicles queueing at the intersection stop line, and the reduced travel lanes for progressing flows caused by buses dwelling at roadside stations with limited storage capacity. In addition, by weighting the bandwidths with the passenger volumes by mode and by direction, the proposed model is capable of offering progression only to the mode(s) and the direction(s) for which it is justified from the perspective of maximizing the benefits to all arterial users. The numerical analysis results have confirmed the effectiveness of the proposed model in producing concurrent progression bands for both modes under various realistic constraints and volume levels. Further evaluation with extensive simulation experiments has also demonstrated that the benefits offered by the proposed model will not be at the cost of other measures of effectiveness.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198119846091
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2403378-9
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  • 2
    Online Resource
    Online Resource
    Operational Analysis and Signal Design for Asymmetric Two-Leg Continuous-Flow Intersection
    SAGE Publications ; 2016
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2553, No. 1 ( 2016-01), p. 72-81
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2553, No. 1 ( 2016-01), p. 72-81
    Abstract: Despite the increasing implementation of the continuous-flow intersection (CFI) in practice, the development of reliable guidelines for its operational analysis and signal design remains in its infancy, especially for the popular two-leg asymmetric CFI design, because of the relatively low cost and desirable efficiency. For best use of the capacity of such a CFI design, a signal optimization model is presented; it can serve as an effective tool for engineers to design the cycle length, phase duration and sequences, and offsets for both its primary and subintersections. By accounting for the commonly encountered constraints of short bay length for turning movements and the interrelations between critical flow movements, the proposed model can prevent queue spillover on left-turn bays and offers concurrent progression for both the through and left-turn flows. To ensure the applicability and effectiveness of the proposed model, this study further uses the data from a proposed asymmetric CFI in Maryland for performance evaluation. The results of extensive simulation with field data confirm that the proposed signal optimization with its capability to account for all physical constraints and flow conflicts can indeed perform as expected; that is, it offers concurrent progression to both through and left-turning flows and prevents any queue from spilling over its designated bay.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2553-08
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
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  • 3
    Online Resource
    Online Resource
    Incorporating Delay Minimization in Design of the Optimized Arterial Signal Progression
    SAGE Publications ; 2022
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2676, No. 4 ( 2022-04), p. 649-668
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2676, No. 4 ( 2022-04), p. 649-668
    Abstract: Despite the abundance of studies on signal progression for arterial roads, most existing models for bandwidth maximization cannot concurrently ensure that the resulting delays will be at a desirable level, especially for urban arterials accommodating high turning volume at some major intersections or constrained by limited turning bay length. Extending from those models that aim to address delay minimization in the progression design, this study provides two enhanced progression maximization models for arterials with high turning volumes. The first model aims to select the signal plan that can produce the lowest total signal delays for all movements from the set of non-inferior offsets produced by MAXBAND. Failing to address the impact of potential turning bay spillback at some critical intersections under such a design may significantly degrade the quality of through progression and increase the overall delay. For this reason, the second model proposed in this study offers the flexibility to trade the progression bandwidths within a pre-specified level for the target delay reduction, especially for turning traffic. The evaluation results from both numerical analyses and simulation experiments have shown that both proposed models can produce the desirable level of performance when compared with the two benchmark models, MAXBAND and TRANSYT 16. The second model yielded the lowest average network delay of 117.2 seconds per vehicle (s/veh), compared with 121.7 s/veh with TRANSYT. Moreover, even its average delay of 141.8 s/veh for through vehicles is comparable with that of 141.2 s/veh by MAXBAND, which is designed mainly to benefit through-traffic flows.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981211064281
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Concurrent Progression of Through and Turning Movements for Arterials Experiencing Heavy Turning Flows and Bay-Length Constraints
    SAGE Publications ; 2019
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2673, No. 9 ( 2019-09), p. 525-537
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2673, No. 9 ( 2019-09), p. 525-537
    Abstract: Contending with congestion on major urban arterials by providing progression bands has long been a priority task for the traffic community. However, on an arterial experiencing heavy left-turn volumes at major intersections, the left-turn queue may spill back rapidly and further degrade the effectiveness of the through progression band if the left-turn volume and the limited bay length have not been accounted for in the optimization of signal coordination plan. Such negative impact from left-turn queues also justifies the need to take into account the concurrent progression of through and left-turn flows on major arterials. To address these two issues, this paper presents a three-staged signal optimization model that can circumvent or minimize the impact of left-turn spillback to the through movements and concurrently minimize the delay of left-turn flows. The proposed model firstly obtains an initial maximized bandwidth from an existing state-of-the-art method and then maximizes the portion of through bandwidth not impeded by the left-turn overflows. The delay of left-turn flows at each intersection will also be minimized under the obtained effective through bandwidth. The results from the numerical analyses have confirmed the benefits and need of including the left-turn volume and its bay length in the design of dual progression for through and left-turn movements. The simulation experiments further show a reduction in the average delay and the number of stops, by 6.4% and 5.5%, respectively, for vehicles traversing an arterial segment of six intersections, compared with the state-of-the-art model, MULTIBAND.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198119843480
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    Arterial-Friendly Local Ramp Metering Control Strategy
    SAGE Publications ; 2021
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2675, No. 7 ( 2021-07), p. 67-80
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2675, No. 7 ( 2021-07), p. 67-80
    Abstract: To prevent local streets being blocked by overflowing on-ramp queues, a standard practice of ramp metering control is to restrain its function when a series of preset conditions are identified by on-ramp queue detectors. Such a trade-off between potential ramp queue spillback and the restraint resulting from the operation of metering control may often fail to either effectively mitigate bottlenecks caused by on-ramp waving or convince arterial users and local traffic agencies of the need for ramp metering operations. This study, therefore, presents an arterial-friendly local ramp metering system (named AF-ramp) that can achieve the target metering rate to produce optimal freeway conditions without ramp queues spilling back onto local streets. This is achieved by concurrently optimizing the signal plans for those intersections that send turning flows to the ramp. At this stage, this system has been developed for time-of-day control. It could also serve as the base module for extending to real-time control, or multi-ramp coordinated operations. The AF-ramp model, with its ability to optimize the arterial signals concurrently with the ramp metering rate, can ensure the best use of the capacity of local intersections and prevent any gridlock caused by overflows from on-ramp queue spillback or arterial turning traffic. With extensive simulation experiments, the evaluation results confirmed the AF-ramp model’s effectiveness in improving traffic conditions on both the freeway and its neighboring arterial links at the same time. This study has also introduced the real-time extension of the proposed model and a framework of a transition from the time-of-day control to fully responsive real-time operations.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198121994581
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Integrating Off-Ramp Spillback Control with a Decomposed Arterial Signal Optimization Model
    SAGE Publications ; 2015
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2487, No. 1 ( 2015-01), p. 112-121
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2487, No. 1 ( 2015-01), p. 112-121
    Abstract: Congestion downstream of a freeway off-ramp often causes the traffic queue to spill back to the main line and thus reduces freeway capacity at the interchange area. To prevent queue spillback, this study proposes a two-stage control model that optimizes the signal plans on an off-ramp connected arterial. The first stage of the model optimizes the green splits for the target intersections and their common cycle length with a specified queue length constraint. The second stage of the model decomposes the target arterial into two groups of segments: one for accommodating the heaving off-ramp turning flows and the other mainly for through traffic on the local arterial. With field data from the freeway interchange in Chupei, Taiwan, the study evaluates the performance with extensive simulation experiments and demonstrates the effectiveness of the proposed model for preventing queue spillbacks at the off-ramp and for minimizing the resulting impact on the freeway main line.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2487-10
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2015
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  • 7
    Online Resource
    Online Resource
    Prediction of Benefits of Special Taxi-Pooling Design for Large Transport Terminals: Case Study of Beijing West Railway Station
    SAGE Publications ; 2016
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2542, No. 1 ( 2016-01), p. 33-44
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2542, No. 1 ( 2016-01), p. 33-44
    Abstract: Taxi-pooling is a newly suggested transport arrangement that may benefit the public in both cost and time. Large transport terminals, such as airports and railway stations, are ideal sites for taxi-pooling because of their large passenger volumes and limited taxi access. However, traditional taxi-pooling methods in these terminals may not be appropriate because of facility and policy restrictions. This study proposes a special taxi-pooling method based on an interactive smartphone application for large transport terminals. The benefits of the proposed method are evaluated through the use of real and simulated data from the Beijing West Railway Station. Three models that consider passengers’ acceptance of and preference for taxi-pooling were built to calculate the reduction in traffic, waiting time, and cost. The results show that the proposed method can effectively improve the travel efficiency and satisfaction of passengers and relieve traffic congestion.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2542-05
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
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  • 8
    Online Resource
    Online Resource
    An Arterial-Based Transit Signal Priority Control System
    SAGE Publications ; 2018
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2672, No. 18 ( 2018-12), p. 1-14
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2672, No. 18 ( 2018-12), p. 1-14
    Abstract: To contend with the negative impacts of intersection-based transit system priority (TSP) control on side-street traffic, and also to enhance its effectiveness from the perspective of the whole traffic flow on the arterial, this study presents an integrated arterial-based TSP system to promote bus operations. The proposed system employs an off-line transit-based progression system to produce the base signal plan, in which is embedded a feature to minimize the negative effects of local TSP implementation on non-priority movements at critical intersections. With its specially designed evaluation function, the proposed system is capable of minimizing the ineffective activation of local TSP which often results in undesirable patterns of traffic arriving at the next intersection downstream and excessive delays for all vehicles. Extensive evaluation with simulation experiments confirms that the proposed system, integrating a local TSP with the transit-based signal progression system, can indeed circumvent the deficiencies of conventional TSP controls and produce the expected benefits to both passenger cars and transit vehicles over the entire arterial road.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/0361198118782753
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
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  • 9
    Online Resource
    Online Resource
    Real-Time Arterial-Friendly Ramp Metering System
    SAGE Publications ; 2022
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2676, No. 6 ( 2022-06), p. 217-235
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2676, No. 6 ( 2022-06), p. 217-235
    Abstract: To balance the benefits between the freeway and arterial users and also to prevent on-ramp queue spillbacks, the authors have developed an arterial-friendly local ramp metering control (AF-ramp) system for time-of-day operations during recurrent congestion. This study presents the real-time version of the AF-ramp (named RAF-ramp) system, with a lane-group-based macroscopic traffic module for predicting traffic state and for executing control strategies, aiming at maximizing the total throughput from the control area, comprising the ramp meter and nearby local intersection signals. Recognizing the discrepancy in the dynamic nature between ramp traffic and arterial flows, the RAF-ramp system with its embedded traffic state prediction and monitoring mechanism can trigger the concurrent optimization of both controls when justified to do so, or only dynamically adjust the ramp metering rate under the pre-optimized local signal environment. The results of extensive simulation experiments have confirmed that the proposed system outperforms the widely-applied real-time ramp control model, ALINEA/Q, under various experimental traffic scenarios, because the produced control strategies can effectively utilize the freeway’s weaving capacity and also best coordinate neighboring intersections’ signals to maximize the entire network’s performance. Such a real-time arterial-friendly ramp metering system, addressing both the time-varying freeway dynamics and the concerns of local traffic users, may well serve as an effective tool for contending with bottlenecks at freeway interchanges.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.1177/03611981221074366
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
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  • 10
    Online Resource
    Online Resource
    Bus Contraflow Lane: Improved Contraflow Approach in Freeway Evacuation
    SAGE Publications ; 2012
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2312, No. 1 ( 2012-01), p. 150-158
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2312, No. 1 ( 2012-01), p. 150-158
    Abstract: The contraflow operation, defined as the use of one or more lanes of inbound travel for traffic movement in the outbound direction during an evacuation, is a widely accepted and adopted strategy for evacuation planning. To reduce the evacuation time of the population with low personal car ownership, a new contraflow approach, named bus contraflow, is proposed in this paper. This approach transforms contraflow lanes into exclusive bus lanes during evacuation. A person-based measure of effectiveness model was developed to assess the evacuation performance of different contraflow approaches. And a simulation road network was then used to compare the performance of the proposed bus contraflow approach with the noncontraflow and conventional contraflow approaches, in three scenarios and five groups of assumptions. The simulation results and following efficiency analysis indicate the potential benefits and widespread applicability of the proposed bus contraflow approach.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2312-16
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2012
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