Variable Speed Limit And Ramp Metering Control Of Highway Networks Using Lax Hopf Method
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Variable Speed Limit And Ramp Metering Control Of Highway Networks Using Lax Hopf Method
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Author : Suyash Chandra Vishnoi
language : en
Publisher:
Release Date : 2020
Variable Speed Limit And Ramp Metering Control Of Highway Networks Using Lax Hopf Method written by Suyash Chandra Vishnoi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This work presents a novel optimization formulation to solve the problem of variable speed limit control on road networks modeled by the Lighthill-Whitham-Richards (LWR) partial differential equation. It also presents some mathematical rules that allow for a reduction in the size and computational time of the optimization problem. Using the analytical solutions to the LWR model, an optimization problem is formulated for the variable speed limit and ramp metering control of traffic on highway networks using the Lax-Hopf algorithm. The resulting problem, which is non-linear in the decision variables, is transformed into a Mixed Integer Linear Program. Examples are presented to show the effectiveness of the approach, including its application to a real-world highway network with multiple ramp connections. The possibility of linear relaxation of integer variables in the problem is also considered. Lastly, the method is compared to a classical Link Transmission Model formulation of the variable speed limit control problem
Proceedings Of The 3rd International Conference On Machine Learning Cloud Computing And Intelligent Mining Mlccim2024
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Author : Fuchun Sun
language : en
Publisher: Springer Nature
Release Date : 2025-01-31
Proceedings Of The 3rd International Conference On Machine Learning Cloud Computing And Intelligent Mining Mlccim2024 written by Fuchun Sun and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-01-31 with Technology & Engineering categories.
The proceedings offer a meticulously curated compilation of peer-reviewed papers presented at the 3rd International Conference on Machine Learning, Cloud Computing and Intelligent Mining (MLCCIM2024). With a profound focus on these domains, this volume serves as an invaluable resource for researchers, experts, professionals, and practitioners engaged in machine learning, control systems, robot, cloud computing and intelligent mining techniques. The conference facilitated a vibrant exchange of knowledge, enabling participants to unveil their pioneering research findings, showcase the outcomes of their latest projects, and engage in thought-provoking discussions to share perspectives and experiences.
Towards An Efficient And Equitable Motorway System Using Ramp Metering And Variable Speed Limits
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Author : Duo Li
language : en
Publisher:
Release Date : 2015
Towards An Efficient And Equitable Motorway System Using Ramp Metering And Variable Speed Limits written by Duo Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Express highways categories.
Ramp metering (RM) and variable speed limits (VSL) are two important ITS tools aimed at improving the performance of motorway systems. The former improves the traffic flow conditions on motorway by limiting the inflow of vehicles from on-ramps; while the latter harmonizes the traffic flow on a motorway mainline by minimizing the variation in speed of vehicles obeying the VSL display. The main goal of this research is to improve the efficiency and equity performance of motorway systems using RM and VSL control measures. A number of RM and VSL control algorithms are proposed in this thesis to achieve this goal. They are assessed for a critical bottleneck section of Auckland Motorway using micro-simulation software AIMSUN. First of all, two existing RM algorithms are assessed namely: ALINEA and HERO. HERO outperformed ALINEA in terms of efficiency and equity benefits. Then, a logic tree based VSL control algorithm is also assessed. The results revealed that the existing logic tree based VSL algorithm cannot improve significantly mobility performance of motorway systems and is rather rough for the speed control. Two alternative VSL control algorithms are proposed namely: a modified logic tree based controller and a fuzzy logic based controller. Both utilize optimized control logics and detector-controller configurations. The proposed algorithms outperformed the existing one in terms of their mobility benefits. In the next step, an integrated RM and VSL control method is proposed to preserve the traffic flow at bottlenecks close to their capacity and avoid excessive delays at on-ramps. The integrated method shows prospect to improve further efficiency and equity performance of motorway systems than operating the RM and VSL controllers independently. Finally, the relationship between efficiency and equity is investigated using a modified HERO strategy; this is aimed at achieving a balance between efficiency and equity gains from RM control. A combined index is proposed combining Gini coefficient and total travel time into one index, which can serve as an objective function to solve the bi-objective control design problem.
Proactive Integrated Control For Relieving Freeway Congestion
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Author : Xu Wang
language : en
Publisher:
Release Date : 2015
Proactive Integrated Control For Relieving Freeway Congestion written by Xu Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Ramp metering (Traffic engineering) categories.
Active bottlenecks limit traffic flow on freeway corridors. To relieve bottleneck severity, ramp metering (RM), variable speed limit (VSL) and their integration are often implemented to control the on-ramp and mainline input flow. Currently, freeway operation has become proactive based on short-term prediction. Macroscopic traffic flow models are often applied as prediction models in proactive traffic control strategies. Prior to field implementation, the models need to be calibrated and validated carefully to ensure that they represent real-life traffic situations. This study proposes modifications for METANET model to adapt it to the unpredictability of bottleneck activation during peak hours. The modified model is calibrated and verified its improvement of model prediction accuracy from segment-specific parameters. The modified model is validated that it can replicate traffic state evolutions during peak hours and be applicable in proactive traffic control practice. Weaving maneuvers (i.e., intensive lane changes) are a major cause of bottlenecks during high-demand periods. To consider weaving impacts in RM, this study introduces a proactive optimal RM algorithm that uses dynamic weaving capacity at weaving segments. Sensitivities of capacity and capacity drop are applied to dynamically estimate weaving capacity within a macroscopic traffic flow model. The proposed traffic flow model conducts estimation in a model predictive control (MPC) frame-work. The proposed RM algorithm is evaluated in macro-simulation and its effectiveness is enhanced by real-time estimated weaving capacity. The RM control research reveals a need of theoretical methods for weaving capacity estimation. This study then defines a linear optimization problem to solve weaving capacity and then establishes a lane-changing model to constrain the weaving flows. The proposed method is evaluated and analyzed for sensitivity with field data from two weaving segments. The capacity estimates from the proposed model are consistent with those from the HCM 2010 model and with field observations. Moreover, the weaving capacity is sensitive to weaving maneuvers. The proposed method is finally applied to estimate the real-time maximum discharge flow rate; the estimates match field measurements. Next, this study presents a proactive integrated control of RM and VSL, with goals to improve network-wide travel time and traffic flow. By decoupling the traffic prediction and simulation models, the possible control error sources are analyzed. The evaluation reveals the proactive integrated control achieves an amelioration in total time spent (TTS) up to 13.65% and an increase in total travel distance (TTD) up to 3.41%. The isolated and integrated controls benefit the traffic network in different extent under different demand scenarios. In addition, control rate profiles are analyzed in detail and found that RM is activated during slight congestion and the most congested situation to assist VSL. Through the integration, the infrastructure utility is maximized. Speed transition zones are complex when dynamically created and shifted by VSL. This study then attempts to represent speed limit effect and estimate real-time driver compliance at speed transition zones. The field data from two speed transition zones are investigated for temporal and spatial variations of speed and driver compliance using statistical tests. After selecting several key factors from statistical tests, a linear regression is established to rank the contributions of the selected factors and other general factors proposed by previous research. The regression results confirm speed limit value, surrounding traffic speed and existence of activated speed enforcement or education devices contribute more to driver compliance. Finally, this study reports the preliminary VSL test and details its implementation procedure on Whitemud Drive, Edmonton, Canada. DynaTAM-VSL software is designed to realize all necessary functions for VSL filed implementation. The preliminary test is conducted, and the VSL control performance and reliability are evaluated. The results for before-and-after VSL control are finally analyzed in depth. The analysis compares average traffic speed, standard deviation of speed, total travel time and total travel distance. The results from this study confirm that VSL can relieve recurrent traffic congestion.
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control
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Author : Xiao-Yun Lu
language : en
Publisher:
Release Date : 2014
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control written by Xiao-Yun Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Electronic traffic controls categories.
Coordinated Ramp Metering Control With Variable Speed Limits For Swiss Freeways
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Author : Nikolas Geroliminis
language : en
Publisher:
Release Date : 2014
Coordinated Ramp Metering Control With Variable Speed Limits For Swiss Freeways written by Nikolas Geroliminis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways
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Author : Kirolos Maged Haleem
language : en
Publisher:
Release Date : 2007
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways written by Kirolos Maged Haleem and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
In summary, Ramp Metering was more beneficial at congested situations, while Variable Speed Limits were more beneficial at free-flow conditions. At conditions approaching congestion, the combination of Ramp Metering and Variable Speed Limits produced the best benefits. These results illustrate the significant potential of ITS strategies to improve the safety and efficiency of urban freeways.
Implementation Of A Variable Speed Limit Ramp Metering Strategy To Increase Freeway Capacity At Metered On Ramps
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Author : Jorge Andrés Laval
language : en
Publisher:
Release Date : 2020
Implementation Of A Variable Speed Limit Ramp Metering Strategy To Increase Freeway Capacity At Metered On Ramps written by Jorge Andrés Laval and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Ramp metering (Traffic engineering) categories.
An Evaluation Of The Joint Operation Of Ramp Metering And Variable Speed Limits Using Corsim
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Author : Evangelos Mintsis
language : en
Publisher:
Release Date : 2012
An Evaluation Of The Joint Operation Of Ramp Metering And Variable Speed Limits Using Corsim written by Evangelos Mintsis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The integrated control scenario is tested against the no control case, the VSL only case and the ramp metering only case. The results (i.e. network wide and link statistics) indicate that the integrated control case outperforms the rest of the traffic management scenarios.
Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations
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Author : Jorge Andrés Laval
language : en
Publisher:
Release Date : 2019
Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations written by Jorge Andrés Laval and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Express highways categories.