Increasing Capacity of an Isolated Merge by Metering Its On-ramp PDF Download
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Author: Michael James Cassidy
Publisher:
ISBN:
Category : Highway capacity
Languages : en
Pages : 48
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Book Description
Measurements taken downstream of freeway/on-ramp merges have verified that discharge flow diminishes when a merge becomes an active bottleneck. We show that metering the on-ramp can recover the higher discharge flow and thereby increase merge capacity. Detailed observations collected using video revealed that the outflow drop following activation was triggered by a queue that formed near the merge in the freeway shoulder lane and then spread laterally, as drivers changed lanes to maneuver around slow traffic. Once restrictive metering mitigated this shoulder lane queue, high outflows often returned to the median lane. Merge outflow could be increased to levels measured prior to the bottleneck activation by then relaxing the metering rate so that inflows from the on-ramp increased. Although outflows recovered in this fashion were unstable and never persisted for periods greater than 13 mins, the findings are the first real evidence that ramp metering can favorably affect the capacity of an isolated merge. The findings point to control strategies that might stabilize outflow and increase merge capacity even more.
Author: Michael James Cassidy
Publisher:
ISBN:
Category : Highway capacity
Languages : en
Pages : 48
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Book Description
Measurements taken downstream of freeway/on-ramp merges have verified that discharge flow diminishes when a merge becomes an active bottleneck. We show that metering the on-ramp can recover the higher discharge flow and thereby increase merge capacity. Detailed observations collected using video revealed that the outflow drop following activation was triggered by a queue that formed near the merge in the freeway shoulder lane and then spread laterally, as drivers changed lanes to maneuver around slow traffic. Once restrictive metering mitigated this shoulder lane queue, high outflows often returned to the median lane. Merge outflow could be increased to levels measured prior to the bottleneck activation by then relaxing the metering rate so that inflows from the on-ramp increased. Although outflows recovered in this fashion were unstable and never persisted for periods greater than 13 mins, the findings are the first real evidence that ramp metering can favorably affect the capacity of an isolated merge. The findings point to control strategies that might stabilize outflow and increase merge capacity even more.
Author: Mohcine Chraibi
Publisher: Springer
ISBN: 3319106295
Category : Computers
Languages : en
Pages : 617
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Book Description
This book continues the biannual series of conference proceedings, which has become a classical reference resource in traffic and granular research alike, and addresses the latest developments at the intersection of physics, engineering and computational science. These involve complex systems, in which multiple simple agents, be they vehicles or particles, give rise to surprising and fascinating phenomena. The contributions collected in these proceedings cover several research fields, all of which deal with transport. Topics include highway, pedestrian and internet traffic; granular matter; biological transport; transport networks; data acquisition; data analysis and technological applications. Different perspectives, i.e., modeling, simulations, experiments, and phenomenological observations are considered.
Author: Andreas Schadschneider
Publisher: Springer Science & Business Media
ISBN: 3540476415
Category : Mathematics
Languages : en
Pages : 719
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Book Description
This book again continues the biannual series of (now six) conference proceedings, which has become a classical reference in traffic and granular research alike. It addresses new developments at the borderline between physics, engineering and computational science. Complex systems, where many simple agents, be it vehicles or particles, give rise to surprising and fascinating phenomena.
Author: Kwangho Kim
Publisher:
ISBN:
Category : Ramp metering (Traffic engineering)
Languages : en
Pages : 44
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Book Description
Author: Jittichai Rudjanakanoknad
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 84
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Book Description
Author: B. B. Das
Publisher: Springer Nature
ISBN: 9811675090
Category : Architecture
Languages : en
Pages : 828
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Book Description
This book includes selected papers from the International Conference on Recent Developments in Sustainable Infrastructure (ICRDSI-2020) and consists of themes pertaining to geotechnical engineering, transportation engineering, environmental engineering and water resources management.
Author: Wuhong Wang
Publisher: Springer Nature
ISBN: 9811506442
Category : Technology & Engineering
Languages : en
Pages : 1505
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Book Description
These proceedings gather selected papers from the 9th International Conference on Green Intelligent Transportation Systems and Safety, held in Guilin, China on July 1-3, 2018. They feature cutting-edge studies on Green Intelligent Mobility Systems, the guiding motto being to achieve “green, intelligent, and safe transportation systems.” The contributions presented here can help promote the development of green mobility and intelligent transportation technologies to improve interconnectivity, resource sharing, flexibility and efficiency. Given its scope, the book will benefit researchers and engineers in the fields of Transportation Technology and Traffic Engineering, Automotive and Mechanical Engineering, Industrial and System Engineering, and Electrical Engineering alike.
Author: Sugiarto
Publisher: Syiah Kuala University Press
ISBN: 6232647408
Category : Architecture
Languages : en
Pages : 104
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Book Description
Indonesia as an emerging country has a lot of traffic bottleneck challenges on urban road networks including in Banda Aceh, the capital of Aceh province. It is due to high traffic demand and limited supply of roadway. Consequently, traffic congestion leads to several externalities such as unnecessary travel times, air pollution, energy consumption, and driver frustration. An unsystematic bottleneck defines as a bottleneck that is without any changes in roadway geometric, and sometimes refers to hidden or virtual bottlenecks. Therefore, I wrote a basic traffic engineering book emphasizing the dynamic capacity method with application on virtual bottlenecks assessments. This book is aimed at undergraduate and postgraduate civil engineers particularly dealing with traffic planning and operation at the virtual bottlenecks. This book is essentially distinguished into six chapters. Chapter I and II deals with the traffic mechanism at unsystematic bottlenecks and its theoretical foundation for assessing the speed and capacity drops due to an active unsystematic bottleneck. The fundamental theory of static and dynamic approaches has been comprehensively discussed in this part. The following part of the chapter, III-VI covers practical assessment by considering U-turn and On-street parking bottlenecks as case studies including simulation methods to determine measures of the effectiveness of the design improvements. Data preparation, observation, analysis, and simulation are broadly deliberated for easy understanding for undergraduate and postgraduate university students. While this book is further intended for traffic engineering practitioners. I suppose that it will also be worth practicing for traffic and transport engineers as designers or planners.
Author: Dominique Lord
Publisher: Elsevier
ISBN: 0128168196
Category : Law
Languages : en
Pages : 504
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Book Description
Highway Safety Analytics and Modeling comprehensively covers the key elements needed to make effective transportation engineering and policy decisions based on highway safety data analysis in a single. reference. The book includes all aspects of the decision-making process, from collecting and assembling data to developing models and evaluating analysis results. It discusses the challenges of working with crash and naturalistic data, identifies problems and proposes well-researched methods to solve them. Finally, the book examines the nuances associated with safety data analysis and shows how to best use the information to develop countermeasures, policies, and programs to reduce the frequency and severity of traffic crashes. - Complements the Highway Safety Manual by the American Association of State Highway and Transportation Officials - Provides examples and case studies for most models and methods - Includes learning aids such as online data, examples and solutions to problems
Author:
Publisher: Elsevier
ISBN: 0081026722
Category : Law
Languages : en
Pages : 4418
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Book Description
In an increasingly globalised world, despite reductions in costs and time, transportation has become even more important as a facilitator of economic and human interaction; this is reflected in technical advances in transportation systems, increasing interest in how transportation interacts with society and the need to provide novel approaches to understanding its impacts. This has become particularly acute with the impact that Covid-19 has had on transportation across the world, at local, national and international levels. Encyclopedia of Transportation, Seven Volume Set - containing almost 600 articles - brings a cross-cutting and integrated approach to all aspects of transportation from a variety of interdisciplinary fields including engineering, operations research, economics, geography and sociology in order to understand the changes taking place. Emphasising the interaction between these different aspects of research, it offers new solutions to modern-day problems related to transportation. Each of its nine sections is based around familiar themes, but brings together the views of experts from different disciplinary perspectives. Each section is edited by a subject expert who has commissioned articles from a range of authors representing different disciplines, different parts of the world and different social perspectives. The nine sections are structured around the following themes: Transport Modes; Freight Transport and Logistics; Transport Safety and Security; Transport Economics; Traffic Management; Transport Modelling and Data Management; Transport Policy and Planning; Transport Psychology; Sustainability and Health Issues in Transportation. Some articles provide a technical introduction to a topic whilst others provide a bridge between topics or a more future-oriented view of new research areas or challenges. The end result is a reference work that offers researchers and practitioners new approaches, new ways of thinking and novel solutions to problems. All-encompassing and expertly authored, this outstanding reference work will be essential reading for all students and researchers interested in transportation and its global impact in what is a very uncertain world. Provides a forward looking and integrated approach to transportation Updated with future technological impacts, such as self-driving vehicles, cyber-physical systems and big data analytics Includes comprehensive coverage Presents a worldwide approach, including sets of comparative studies and applications
