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Optimization And Microsimulation Of On Ramp Metering For Congested Freeways
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Book Synopsis Optimization and Microsimulation of On-ramp Metering for Congested Freeways by : Gabriel Clemente Gomes
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 Synopsis Critical Assessment of the Features of Two Ramp Metering Optimization Models by : Eunmi Park
Download or read book Critical Assessment of the Features of Two Ramp Metering Optimization Models written by Eunmi Park and published by . This book was released on 1993 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FREQ8PE, a Freeway Corridor Simulation and Ramp Metering Optimization Model by : Tsutomu Imada
Download or read book FREQ8PE, a Freeway Corridor Simulation and Ramp Metering Optimization Model written by Tsutomu Imada and published by . This book was released on 1985 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Micro-simulation Test of Two-level Optimization-based Ramp Metering Controls by : Vishnu Sharma Kesaraju
Download or read book A Micro-simulation Test of Two-level Optimization-based Ramp Metering Controls written by Vishnu Sharma Kesaraju and published by . This book was released on 2005 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluating Ramp Metering and Variable Speed Limits to Reduce Crash Potential on Congested Freeways Using Micro-simulation by : Albinder Singh Dhindsa
Download or read book Evaluating Ramp Metering and Variable Speed Limits to Reduce Crash Potential on Congested Freeways Using Micro-simulation written by Albinder Singh Dhindsa and published by . This book was released on 2005 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent research at UCF into defining surrogate measures for identifying crash prone conditions on freeways has led to the introduction of several statistical models which can flag such conditions with a good degree of accuracy. Outputs from these models have the potential to be used as real-time safety measures on freeways. They may also act as the basis for the evaluation of several intervention strategies that might help in the mitigation of risk of crashes.
Book Synopsis Ramp Metering Algorithms and Approaches for Texas by :
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 Synopsis Ramp Metering Status in North America by : James Robinson
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 Synopsis RHODES-ITMS-MILOS by : Frank W. Ciarallo
Download or read book RHODES-ITMS-MILOS written by Frank W. Ciarallo and published by . This book was released on 2002 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The RHODES-Integrated Traffic Management System Program addresses the design and development of a real-time traffic adaptive control system for an integrated system of freeways and arterial roads. The goals of this project were to test coordinated, adaptive ramp metering using the Multi-Objective, Integrated, Large-Scale, and Optimized System (MILOS) software on a major urban freeway. A 7-mile eastbound segment of I-10 in Phoenix, just west of the I-10/I-17 Interchange, was chosen as the study area because of the availability of data, and because of recurring congestion.
Book Synopsis A New Ramp Metering Control Algorithm for Optimizing Freeway Travel Times by : Darren Lierkamp
Download or read book A New Ramp Metering Control Algorithm for Optimizing Freeway Travel Times written by Darren Lierkamp and published by . This book was released on 2006 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In many cities around the world traffic congestion has been increasing faster than can be dealt with by new road construction. To resolve this problem traffic management devices and technology such as ramp meters are increasingly being utilized."--leaf 1.
Book Synopsis Evaluation of Coordinated and Local Ramp Metering Algorithm Using Microscopic Traffic Simulation by : Joseph Ralph Scariza
Download or read book Evaluation of Coordinated and Local Ramp Metering Algorithm Using Microscopic Traffic Simulation written by Joseph Ralph Scariza and published by . This book was released on 2003 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coordination of Freeway Ramp Meters and Arterial Traffic Signals Field Operational Test (FOT) by : Xiao-Yun Lu
Download or read book Coordination of Freeway Ramp Meters and Arterial Traffic Signals Field Operational Test (FOT) written by Xiao-Yun Lu and published by . This book was released on 2013 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Microsimulation Analysis of the Mobility Impacts of Intersection Ramp Metering by : William Jared Wall
Download or read book A Microsimulation Analysis of the Mobility Impacts of Intersection Ramp Metering written by William Jared Wall and published by . This book was released on 2013 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urban freeway demand that frequently exceeds capacity has caused many agencies to consider many options to reduce congestion. A series of solutions that falls under the Active Traffic Management (ATM) banner have shown promising potential. Perhaps the most popular ATM strategy is ramp metering. Ramp metering involves limiting the access of vehicles to freeways at an entrance ramp. By doing this, freeway throughput, speeds, and travel time reliability can be increased, while the number of traffic incidents can be decreased. This study examines the application of an innovative ramp metering strategy, Intersection Ramp Metering (IRM), at a section of Loop 1 in Austin, TX. IRM implements the ramp metering function at the intersection immediately upstream of the entrance ramp, rather than on the ramp itself. A microsimulation analysis of this application is performed in VISSIM, and the results confirm that freeway throughput (+10%), and system average travel time (-14%), can be improved, as well as several other performance measures.
Book Synopsis Ramp Adapative Metering Bottleneck Optimization (RAMBO) User's Manual by : Carroll J. Messer
Download or read book Ramp Adapative Metering Bottleneck Optimization (RAMBO) User's Manual written by Carroll J. Messer and published by . This book was released on 1994 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Freeway Optimizing Utilizing Ramp Metering by :
Download or read book Freeway Optimizing Utilizing Ramp Metering written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a discussion of a computer optimization program, which is used to optimize ramp metering and freeway flow by timing ramp signals to prevent excessive queuing on ramps while simultaneously minimizing delay on the freeway. the program can be used to design for a specified level of service and/or ramp queuing capacities based on the users constraints. This computer program was calibrated based on a specific section of the Milwaukee County Interstate HIghway (IH) 94 freeway sysetms. Data inputs to the program include freeway volumes, ramp volumes, distances between ramps, and ramp wueuing capacities. The optimization program is a spreadsheet template so additional ramps can be easily added. Guidelines for application and further calibration with IVHS systems are discussed. Conclusions drawn from the optimization program and suggestions for further study are also presented. For the covering abstract of this conference, see IRRD number 863140.
Book Synopsis Algorithm Design, User Interface, and Optimization Procedure for a Fuzzy Logic Ramp Metering Algorithm by : Cynthia E. Taylor
Download or read book Algorithm Design, User Interface, and Optimization Procedure for a Fuzzy Logic Ramp Metering Algorithm written by Cynthia E. Taylor and published by . This book was released on 2000 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Freeway System Ramp Metering Strategies for Texas by : Carroll J. Messer
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 Synopsis Evaluation of Freeway High Occupancy Vehicle Lanes and Ramp Metering by :
Download or read book Evaluation of Freeway High Occupancy Vehicle Lanes and Ramp Metering written by and published by . This book was released on 1980 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
