Evaluation of Ramp Meter Effectiveness for Wisconsin Freeways PDF Download

Author: Jittichai Rudjanakanoknad
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 84

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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:
Publisher:
ISBN:
Category : Express highway interchanges
Languages : en
Pages : 348

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Author: Kwangho Kim
Publisher:
ISBN:
Category : Ramp metering (Traffic engineering)
Languages : en
Pages : 44

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Book Description

Author: Robert Gordon
Publisher: Springer Science & Business Media
ISBN: 1441907335
Category : Technology & Engineering
Languages : en
Pages : 219

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Book Description
Intelligent Freeway Transportation Systems: Functional Design focuses on the efficient use of resources in the design of ITS. It discusses the principles of top down design starting with objectives and requirements, and provides guidance for the development and evaluation of functional design alternatives according to cost effectiveness principles. It shows how transportation planning principles such as Wardrop’s Laws and traffic diversion principles relate to functional ITS device selections and equipment locations. Methodologies for translating objectives to functional device types are provided. Application factors to identify device deployment densities (e.g. number of detectors per mile) as a function of traffic conditions are provided, as are evaluation models for evaluating the benefits of design alternatives based on traffic conditions. Design guidance and benefits evaluation include the following functions: (1) Non-recurrent congestion – Improvement of incident clearance time, (2) Non recurrent congestion – Incident information to motorists, (3) Recurrent congestion – Information to motorists, (4) Ramp metering, (5) Motorist service patrols.

Author: Pushkin Kachroo
Publisher: Springer Science & Business Media
ISBN: 1441989617
Category : Technology & Engineering
Languages : en
Pages : 343

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Book Description
Feedback Ramp Metering in Intelligent Transportation Systems is the first book on the topic of using feedback control (also called real-time traffic control or adaptive control by some traffic engineers) in ramp metering. It provides traffic theory fundamentals and then the design of feedback controllers for isolated and coordinated ramp metering problems. Software simulation code in Matlab and Paramics is provided in the book so that the reader can get a hands-on feel for the various algorithms. With a large number of examples, illustrations, and original problems, this book is excellent as a textbook or reference book for a senior or graduate level course on the subject, as well as a reference for researchers in related fields.

Author: Carlos F. Daganzo
Publisher: Pergamon Press
ISBN:
Category : Business & Economics
Languages : en
Pages : 364

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Book Description
The basic concepts in the transportation and traffic operations field that should be understood by every transportation professional are presented here in a thorough, coherent, and self-contained way. Introductory chapters on "tools" cover topics such as graphical methods, optimization, probability, stochastic processes, statistics and simulation; these are complemented by application chapters on traffic dynamics, control, observation, and scheduled modes, where the fundamental ideas are presented in depth. A key element of the author's approach is that only that material is presented which is definitely known and correct. At the same time, an effort has been made to point out various pitfalls and common errors so that they can be avoided. The result is an invaluable source of reliable, well grounded and clearly explained ideas, tools and techniques for the transportation professional.

Author: James Robinson
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 28

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Book Description

Author: Nadeem A. Chaudhary
Publisher:
ISBN:
Category : Express highways
Languages : en
Pages : 28

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Book Description

Author: Virginia P. Sisiopiku
Publisher:
ISBN:
Category : Electronic traffic controls
Languages : en
Pages : 176

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Book Description