Empirical Study of Ramp Metering and Capacity PDF Download
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Author: Michael James Cassidy
Publisher:
ISBN:
Category : Express highway interchanges
Languages : en
Pages : 52
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Book Description
This report describes traffic details measured at a freeway merge before and after it became a bottleneck during six observation days. Findings indicate that flows departing this merge can be made substantially higher by metering the on-ramp to restrict the rate its vehicles enter the freeway. It follows then that ramp meters can postpone a bottleneck's activation.
Author: Michael James Cassidy
Publisher:
ISBN:
Category : Express highway interchanges
Languages : en
Pages : 52
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Book Description
This report describes traffic details measured at a freeway merge before and after it became a bottleneck during six observation days. Findings indicate that flows departing this merge can be made substantially higher by metering the on-ramp to restrict the rate its vehicles enter the freeway. It follows then that ramp meters can postpone a bottleneck's activation.
Author: Lei Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The objective of this study is to determine whether ramp meters increase the capacity of active freeway bottlenecks, and if they do, how. The traffic flow characteristics at twenty-seven active bottlenecks in the Twin Cities have been studied for seven weeks without ramp metering and seven weeks with ramp metering. A series of hypotheses regarding the relationships between ramp metering and the capacity of active bottlenecks are developed and tested against empirical traffic data. It is found that meters increase the bottleneck capacity by postponing and sometimes eliminating bottleneck activations (a 73% increase in the duration of the pre-queue transition period), accommodating higher (2%) flows during the pre-queue transition period, and increasing queue discharge flow rates after breakdown (3%). The two-capacity hypothesis about flow drops after breakdown was also examined and results strongly suggest the percentage flow drops at various bottlenecks follow a normal distribution (mean 5.5%, standard deviation 2.3%). The implications of these findings on the design of efficient ramp control strategies are discussed, as well as future research directions.
Author: Hamed Benouar
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Book Description
Author:
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages :
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Book Description
Author: Wuhong Wang
Publisher: Springer
ISBN: 9811035512
Category : Technology & Engineering
Languages : en
Pages : 1037
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Book Description
These proceedings collect selected papers from the 7th International Conference on Green Intelligent Transportation System and Safety held in Nanjing on July 1-4, 2016. The selected works, which include state-of-the-art studies, are intended to promote the development of green mobility and intelligent transportation technology to achieve interconnectivity, resource sharing, flexibility and higher efficiency. They offer valuable insights for researchers and engineers in the fields of Transportation Technology and Traffic Engineering, Automotive and Mechanical Engineering, Industrial and System Engineering, and Electrical Engineering.
Author: Antonella Ferrara
Publisher: Springer
ISBN: 3319759612
Category : Technology & Engineering
Languages : en
Pages : 324
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Book Description
This monograph provides an extended overview of modelling and control approaches for freeway traffic systems, moving from the early methods to the most recent scientific results and field implementations. The concepts of green traffic systems and smart mobility are addressed in the book, since a modern freeway traffic management system should be designed to be sustainable. Future perspectives on freeway traffic control are also analysed and discussed with reference to the most recent technological advancements The most widespread modelling and control techniques for freeway traffic systems are treated with mathematical rigour, but also discussed with reference to their performance assessment and to the expected impact of their practical usage in real traffic systems. In order to make the book accessible to readers of different backgrounds, some fundamental aspects of traffic theory as well as some basic control concepts, useful for better understanding the addressed topics, are provided in the book. This monograph can be used as a textbook for courses on transport engineering, traffic management and control. It is also addressed to experts working in traffic monitoring and control areas and to researchers, technicians and practitioners of both transportation and control engineering. The authors’ systematic vision of traffic modelling and control methods developed over decades makes the book a valuable survey resource for freeway traffic managers, freeway stakeholders and transportation public authorities with professional interests in freeway traffic systems. Advances in Industrial Control reports and encourages the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.
Author: James H. Banks
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 98
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Book Description
Author: E. D. Arnold
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 32
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Book Description
Ramp metering is an effective, viable, and practical strategy used to manage freeway traffic. It is a proven freeway management technique as various forms of ramp control have been in place since the 1960s in the Chicago, Detroit, and Los Angeles areas. Due in part to the success of these early applications, ramp metering has received increased emphasis in recent years under the umbrella of advanced traffic management systems (ATMS), a component of intelligent transportation systems (ITS). ITS America reports that there are currently more than 40 ATMS deployed, under construction, or in the planning stage in the U.S. by state transportation agencies. The future of ramp metering is also in this ITS context. Integration and interface with local street system control and other advanced ITS traffic control systems such as advanced vehicle control systems, dynamic route guidance, and advanced traveler information systems are the latest in ramp metering applications. Ramp meters are in place and working effectively on segments of I-395 and I-66 in Northern Virginia. The Virginia Department of Transportation is very much interested in the feasibility of implementing ramp metering on other segments of freeways throughout the state. Accordingly, the purpose of this study was to review and synthesize the existing literature on ramp metering. Specific topics included in the review were: impacts of ramp metering, including its advantages/benefits and disadvantages/disbenefits, warrants, criteria, and guidelines for ramp metering, metering rates. Detailed information on these topics is included in the report as well as general conclusions regarding ramp metering.
Author: Serge P. Hoogendoorn
Publisher: Springer Science & Business Media
ISBN: 354028091X
Category : Mathematics
Languages : en
Pages : 593
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Book Description
These proceedings are the fifth in the series Traffic and Granular Flow, and we hope they will be as useful a reference as their predecessors. Both the realistic modelling of granular media and traffic flow present important challenges at the borderline between physics and engineering, and enormous progress has been made since 1995, when this series started. Still the research on these topics is thriving, so that this book again contains many new results. Some highlights addressed at this conference were the influence of long range electric and magnetic forces and ambient fluids on granular media, new precise traffic measurements, and experiments on the complex decision making of drivers. No doubt the “hot topics” addressed in granular matter research have diverged from those in traffic since the days when the obvious analogies between traffic jams on highways and dissipative clustering in granular flow intrigued both c- munities alike. However, now just this diversity became a stimulating feature of the conference. Many of us feel that our joint interest in complex systems, where many simple agents, be it vehicles or particles, give rise to surprising and fascin- ing phenomena, is ample justification for bringing these communities together: Traffic and Granular Flow has fostered cooperation and friendship across the scientific disciplines.
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.
