Discrete release rate impact on ramp metering performance

Kotsialos, Apostolos; Papageorgiou, Markos; Hayden, Jacky; Higginson, Roger; McCabe, Keith; Rayman, N

doi:10.1049/ip-its:20055003

Cited by 16 publications

(9 citation statements)

References 1 publication

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“…This because the conflicts between the merging and main carriageway vehicles occur at the extremes of the merging platoon and the main carriageway gap G. Therefore, larger platoons have less conflicting zones per vehicle. The disadvantage of releasing platoons is that they create stronger disruptions on the main carriageway flow while merging [6], [24]. The effects of this design on the control strategy performance are evaluated using simulation in the next sections, while the consequences of miss-coordination between gaps and merging platoons are left for further work.…”

Section: Strategymentioning

confidence: 99%

“…This concept of rate of breakdown is related to that of stochastic motorway capacity as introduced and empirically analysed by Brilon et al [4]. While [3] and [4] proposed a stochastic nature of breakdown and capacity, other authors identified the perturbations of merging vehicles as the cause of breakdown at on-ramp merges [5], [6]. These perturbations can be created by aggressive driving, relaxation phenomenon and by vehicles that are not able to find a suitable gap during the merging manoeuvre [7]; therefore, they are forced to decrease their speed when they approach the end of the acceleration lane.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Traffic Performance of a Merging Assistant Strategy Using Cooperative Vehicles

Scarinci

Heydecker

Hegyi

2015

IEEE Trans. Intell. Transport. Syst.

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Abstract-Emerging in-car communication technologies continually offer new communication capabilities between vehicles and infrastructure that, together with more accurate positioning systems, can be used to improve the use of current infrastructure. The aim of this paper is to present a novel merging assistant strategy that exploits cooperative systems to reduce congestion at motorway junctions. This new system, called Cooperative Merging Assistant, groups main carriageway vehicles together and collects the inter-vehicle spaces into gaps that are usable by merging traffic. These gaps will facilitate the coordinated entry of platoons of vehicles released by an on-ramp traffic signal. The performance of this new system is evaluated using microscopic simulation. Results show the reduction of late-merging vehicles, decrease in congestion and increase of merging capacity. This study shows how the use of cooperative systems can improve the the merging maneuver and so lead to a reduction of congestion on motorways.

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Section: Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Traffic Performance of a Merging Assistant Strategy Using Cooperative Vehicles

Scarinci

Heydecker

Hegyi

2015

IEEE Trans. Intell. Transport. Syst.

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“…In the proposed algorithm, each ramp meter can eventually have 37 released metering rates with a minimum control resolution of 0.025. Since the effect of the discretization can be negligible when the numbers of released metering rates are no less than ten [24], a discretization with 37 released rates is considered sufficient for a ramp meter.…”

Section: A Dp Decision Networkmentioning

confidence: 99%

“…Since 10 released rates are normally sufficient for a ramp meter [24], the proposed IDP algorithm can also be simplified to handle more on-ramps, where a ramp meter can be set to 4 released meter rates within a range of 1for the first search and set to 3 released rates within a range of 0.2 for the second search. In this way, up to 7 on-ramps can be controlled with reasonable amount of computing time (40~45 s).…”

Section: Real-time Implementation Issuesmentioning

confidence: 99%

Optimal Coordination of Ramp Metering Via Iterative Dynamic Programming

Wang

Alam

et al. 2014

Int. J. ITS Res.

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This paper presents an online approach for the optimal coordination and control of ramp metering. The ramp metering problem is formulated in a decision network and subsequently solved by iterative dynamic programming (IDP), where a near optimal ramp metering policy is obtained by minimizing the total travel time spent (TTS). The optimal metering policy is implemented under the framework of receding horizon control. In this study, by incorporating METANET for traffic flow model, a study location is simulated and the performance of the proposed algorithm is measured and compared to those without ramp metering and with a local uncoordinated ramp metering. Results show that the proposed method is able to improve traffic conditions and prevent recurrent congestion under certain ramp queue constrains.

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“…These approaches have the advantage of reducing the discrepancy between the demand prediction and the real demand. Examples of MPC ramp metering strategies include the work developed by Hegyi et al [21], Kotsialos et al [22], and Papamichail et al [23].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of probe‐based ramp metering with detector‐based and pretimed ramp metering

Kattan

Saidi

2012

J of Advced Transportation

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SUMMARY In this paper, a probe‐based adaptive ramp metering approach has been developed and compared with a detector‐based and pretimed ramp metering approaches using PARAMICS microsimulation model made by Quadstone Limited. Both examined probe‐based and detector‐based ramp metering approaches adopt the same problem formulation; however, they differ by the data source that provides estimates of their input parameters. The probe‐based approach takes as main input space mean speed extracted from vehicle probes moving constantly on the entire freeway. The detector‐based approach takes the density readings directly from point detectors placed upstream and downstream of each on‐ramp. The developed approach formulates the ramp metering rates to simultaneously reduce freeway travel time and decrease delays on ramps. A dynamic weighting scheme is adopted in this formulation to give different weighting schemes to the various freeway sections and the on‐ramps. These weights are able to adjust dynamically based on prevailing and forecasted traffic conditions to give priority in each step to the sections of the freeways or/and on‐ramps experiencing critical traffic conditions. The comparative analysis of the three ramp metering approaches was conducted on an 8‐km freeway section on Highway 2 in Calgary, Alberta, Canada. The results of the analysis indicate that the probe‐based algorithm consistently outperformed the two other approaches in terms of all performance measures. The probe‐based approach is shown to exceed the performance of the detector‐based approach with a market share of vehicle probes as low as 3%. The results of the analysis are promising and show the effectiveness of developing ramp metering control algorithms taking the main input parameters from vehicle probes on the freeway. Copyright © 2012 John Wiley & Sons, Ltd.

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Discrete release rate impact on ramp metering performance

Cited by 16 publications

References 1 publication

Analysis of Traffic Performance of a Merging Assistant Strategy Using Cooperative Vehicles

Analysis of Traffic Performance of a Merging Assistant Strategy Using Cooperative Vehicles

Optimal Coordination of Ramp Metering Via Iterative Dynamic Programming

Comparative analysis of probe‐based ramp metering with detector‐based and pretimed ramp metering

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