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EBookClubs

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Book Evaluation of Traffic Responsive Ramp Control

Download or read book Evaluation of Traffic Responsive Ramp Control written by Richard M. Johnson and published by . This book was released on 1974 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Ramp Metering Status in North America

Download or read book Ramp Metering Status in North America written by James Robinson and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Ramp Metering Algorithms and Approaches for Texas

Download or read book Ramp Metering Algorithms and Approaches for Texas written by and published by . This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this project was to compare ramp metering algorithms and develop guidelines for improving ramp metering operations in Texas. As part of this research project, researchers collected data at several sites in Houston, Texas. Data analysis showed that many congested freeways are facing heavy ramp demand, and require significant changes in existing ramp metering operations if ramp metering continues to be used as part of freeway traffic management. Furthermore, researchers used computer simulation to compare the effectiveness of ALINEA with queue flush with the existing strategy of metering at the maximum rate with queue flushing. Researchers found that ALINEA does not provide any benefits when queue flushing is permitted. Under heavy demand conditions such as those in Houston, the current strategy to meter at the fastest rate remains the most beneficial. However, this strategy also provides limited benefits. Finally, researchers developed guidelines and recommendations for current and future ramp metering operations in Texas. This report documents the research results.

Book Optimization and Microsimulation of On ramp Metering for Congested Freeways

Download or read book Optimization and Microsimulation of On ramp Metering for Congested Freeways written by Gabriel Clemente Gomes and published by . This book was released on 2004 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates various aspect of the design and testing of on-ramp metering control systems, including optimization-based control and microscopic freeway modeling. A new technique for generating optimal metering plans is developed. As with most predictive designs, the ramp metering rates are found as the solution to a nonlinear optimization problem. In contrast to previous designs, the new approach 1) produces a globally optimal solution to the nonlinear problem, 2) requires only to solve a single linear program, and 3) allows the enforcement of hard constraints on the on-ramp queue lengths. The price that is paid for these features is that the objective function being minimized is not Total Travel Time, but rather a member of a class of "TTT-like" objective functions. A TTT-like objective function is defined as a linear combination of mainline flows with weights that, similarly to the Total Travel Time cost weights, decrease linearly in time from some initial value to zero at the final time. An example application of the technique shows that the globally optimal metering plan with respect to a TTT-like objective function also performs well in terms of Total Travel Time. A macroscopic analysis of local traffic-responsive ramp metering on a short stretch of freeway, with a single on-ramp and no offramps, is also presented. The study compares the performance of two popular local traffic-responsive ramp metering algorithms: Alinea and Percent-Occupancy, and addresses issues pertaining to parameter tuning and loop-detector placement. The second half of the dissertation describes the construction of a detailed microsimulation model of a stretch of Interstate 210 in Pasadena, CA. The VISSIM microsimulation package was used to create this model. Descriptions of the data gathering and processing procedures, bottleneck identification, network coding, and model calibration are provided. The model is used to test the performance of candidate local traffic-responsive controllers. Questions concerning the relative merits of these controllers, parameter tuning, and loop-detector placement are addressed in the context of the large-scale microscopic model.

Book Advanced Freeway System Ramp Metering Strategies for Texas

Download or read book Advanced Freeway System Ramp Metering Strategies for Texas written by Carroll J. Messer and published by . This book was released on 1993 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freeway ramp metering systems have been used to improve urban freeway flow. However, control strategies must be properly adjusted to account for ramp queues overflowing onto surface streets and provide equitable on-ramp control during various operating periods. An improved solution can be obtained by optimizing this problem simultaneously for a group of time slices. This study identifies and examines a microcomputer-based optimization scheme that can assist in developing efficient freeway control strategies for on-line freeway surveillance and control. A multi-level freeway control structure is employed for which ramp metering control algorithms are developed for each level of control. Flow-based and lane occupancy-based system algorithms are presented. Detailed data file requirements are provided for each control level. A microcomputer prototype, or laboratory test version of the system level, will be described in a companion project report.

Book Study of traffic responsive ramp closure control

Download or read book Study of traffic responsive ramp closure control written by and published by . This book was released on 1972 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Urban Freeway Surveillance and Control

Download or read book Urban Freeway Surveillance and Control written by Paul F. Everall and published by . This book was released on 1972 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes freeway conditions which are subject to improvement by means of electronic surveillance and control. Ramp metering is presented along with a benefit-cost analysis of its effectiveness.

Book The Future National Highway Program 1991 and Beyond

Download or read book The Future National Highway Program 1991 and Beyond written by and published by . This book was released on 1987 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Announcement of Highway Safety Literature

Download or read book An Announcement of Highway Safety Literature written by and published by . This book was released on 1972 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Intelligent Freeway Transportation Systems

Download or read book Intelligent Freeway Transportation Systems written by Robert Gordon and published by Springer Science & Business Media. This book was released on 2009-10-06 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Control Computers Communications in Transportation

Download or read book Control Computers Communications in Transportation written by J.-P. Perrin and published by Elsevier. This book was released on 2014-06-28 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume investigates developments and future trends in transportation research and what effects they will have on society. The coverage is broad; including road (urban and motorway), rail and air-traffic control. The sections deal with safety aspects, modelling and simulation, the use of sensors and image processing. The final section covers the development and implementation of new route guidance systems. This up-to-date information will be of use to transport engineers, urban planners, operations research and systems scientists.