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Author : S. M. Mahabubul Alam
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (485 download)
Download or read book Evaluation of Signal Timing Optimization Software written by S. M. Mahabubul Alam and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book National Signal Timing Optimization Project written by and published by . This book was released on 1982 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of the National Signal Timing Organization Project initiated by the Federal Highway Administration as a fuel conservation effort. The objectives of this project are: 1) to establish credible data on the effectiveness of signal timing optimization; 2) to make signal timing optimization projects easier to do; and 3) to define the resources (cost, level of staff, computer, etc.) required to undertake a signal timing optimization project, so that traffic engineers and administrators can more effectively budget for this activity. The project consisted of the development of the TRANSYT-7F signal timing optimization program User's Manual, and training course, and application of the program in 11 cities nationwide to evaluate the effectiveness of the poptimized signal timing plans and to collect data on the needed resources.
Author : Andrew C. M. Mao
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (829 download)
Download or read book Evaluation of Signal Timing Variables Using a Signal Timing Optimization Program written by Andrew C. M. Mao and published by . This book was released on 1982 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Byungkyu Park
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (555 download)
Download or read book Evaluation of Traffic Signal Timing Optimization Methods Using a Stochastic and Microscopic Simulation Program written by Byungkyu Park and published by . This book was released on 2003 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated existing traffic signal optimization programs including Synchro, TRANSYT-7F, and genetic algorithm optimization using real-world data collected in Virginia. As a first step, a microscopic simulation model, VISSIM, was extensively calibrated and validated using field data. Multiple simulation runs were then made for signal timing plans such that drivers' behavior, day-to-day traffic variation, etc. were considered in the evaluation. Finally, long-term demand growth or changes were statistically modeled and evaluated, again using multiple simulation runs. Five timing plans were evaluated using the simulation test bed. The timing plans under evaluation included (1) the former timing plan of the Virginia Department of Transportation(VDOT), (2) VDOT's current timing plan, (3) the genetic algorithm optimized timing plan, (4)the Synchro optimized timing plan, and (5) the TRANSYT-7F optimized timing plan. The simulation study results indicated that the current practice of VDOT's current signal optimization procedure significantly improved upon its former one by reducing travel times by 17% and total system delay by 36%. The three "optimized" timing plans did not provide significant improvements. Evaluation of the Lee-Jackson Memorial Highway network showed that the current VDOT signal optimization procedure significantly improved the performance of network operations. Thus, the study recommended that VDOT continue using its procedure for developing new timing plans but that it evaluate its signal timing plan regularly so that it does not become outdated
Author :
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (121 download)
Download or read book National Signal Timing Optimization Project written by and published by . This book was released on 1982 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of the National Signal Timing Organization Project initiated by the Federal Highway Administration as a fuel conservation effort. The objectives of this project are: 1) to establish credible data on the effectiveness of signal timing optimization; 2) to make signal timing optimization projects easier to do; and 3) to define the resources (cost, level of staff, computer, etc.) required to undertake a signal timing optimization project, so that traffic engineers and administrators can more effectively budget for this activity. The project consisted of the development of the TRANSYT-7F signal timing optimization program User's Manual, and training course, and application of the program in 11 cities nationwide to evaluate the effectiveness of the poptimized signal timing plans and to collect data on the needed resources.
Author : U.s. Department of Transportation
Publisher : CreateSpace
ISBN 13 : 9781508557173
Total Pages : 286 pages
Book Rating : 4.5/5 (571 download)
Download or read book Traffic Signal Timing Manual written by U.s. Department of Transportation and published by CreateSpace. This book was released on 2015-02-20 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report serves as a comprehensive guide to traffic signal timing and documents the tasks completed in association with its development. The focus of this document is on traffic signal control principles, practices, and procedures. It describes the relationship between traffic signal timing and transportation policy and addresses maintenance and operations of traffic signals. It represents a synthesis of traffic signal timing concepts and their application and focuses on the use of detection, related timing parameters, and resulting effects to users at the intersection. It discusses advanced topics briefly to raise awareness related to their use and application. The purpose of the Signal Timing Manual is to provide direction and guidance to managers, supervisors, and practitioners based on sound practice to proactively and comprehensively improve signal timing. The outcome of properly training staff and proactively operating and maintaining traffic signals is signal timing that reduces congestion and fuel consumption ultimately improving our quality of life and the air we breathe. This manual provides an easy-to-use concise, practical and modular guide on signal timing. The elements of signal timing from policy and funding considerations to timing plan development, assessment, and maintenance are covered in the manual. The manual is the culmination of research into practices across North America and serves as a reference for a range of practitioners, from those involved in the day to day management, operation and maintenance of traffic signals to those that plan, design, operate and maintain these systems.
Author : Byungkyu Park
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.3/5 (555 download)
Download or read book Investigation of Schedules for Traffic Signal Timing Optimization written by Byungkyu Park and published by . This book was released on 2005 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic signal optimization is recognized as one of the most cost-effective ways to improve urban mobility; however the extent of the benefits realized could significantly depend on how often traffic signal re-optimization occurs. Using a case study from the Northern Virginia Smart Traffic Signal System (NVSTSS), this project sought to determine how often traffic signals need to be re-optimized to provide the greatest benefits. This project developed a new traffic signal timing plan evaluation and optimization program by combining the Integrated SYNCHRO and Platoon Dispersion (ISAPD) model and the OptQuest optimization program. Based on 2001 (base scenario) and 2004 traffic data, five scenarios of re-optimization time intervals (i.e., 2 weeks, 4 weeks, 8 weeks, 16 weeks, and 1 year) were investigated. Study results indicate that (1) determining time intervals for re-optimization in the NVSTSS is feasible; (2) among the various re-optimization time intervals investigated for the Route 50 case study network, the time interval of 1 year was the best for both midday and the PM peak; and (3) the annual net savings from implementing this 1-year re-optimization time interval could be as high as $107,340 and $254,436, respectively, given the assumptions used in the study. The report recommends (1) the annual re-optimization of the Route 50 corridor traffic signal system; (2) the NVSTSS implementation of the combined ISAPS and OptQuest program for measuring "regrets" of not maintaining the optimal timing plan; (3) the adoption by VDOT traffic engineers of the methodology developed in this study, which is based on the combined ISAPD and OptQuest program, for making decisions regarding traffic signal re-optimization; and (4) a future study to investigate the impact of traffic volume growth rates and changes in turning movements as a means of assisting with determinations about traffic signal timing plan re-optimization.
Author :
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (641 download)
Download or read book National Signal Timing Optimization Project written by and published by . This book was released on 1982 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Fontaine
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (918 download)
Download or read book Evaluation of the Virginia Department of Transportation Adaptive Signal Control Technology Pilot Project written by Michael Fontaine and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, most traffic signals operated by the Virginia Department of Transportation (VDOT) use actuated plans that vary by time of day (TOD) and day of the week. These timing plans are typically developed off-line using traffic count information collected in the field and then processed using signal optimization software. This method works well as long as traffic volumes remain consistent with the conditions used to develop the timing plan, but timing plans can become suboptimal if traffic demands deviate from those conditions. Traffic growth over time, seasonal changes in traffic, special events, or incidents can all cause TOD plans to perform poorly, resulting in increased delays to drivers. As a result, VDOT must regularly retime signalized intersections to deal with long-term changes in travel patterns, which incurs costs to VDOT. Even so, non-recurring events can still cause TOD plans to perform poorly. Adaptive signal control technology (ASCT) is one tool that has been proposed to handle variable traffic demand better. VDOTs Traffic Engineering Division began a pilot program to install the InSync ASCT developed by Rhythm Engineering on 13 corridors around the state beginning in 2011. The InSync system uses enhanced detection along a corridor to adjust signal timing parameters dynamically to meet observed demand in real time, eliminating the need to develop static timing plans. This allows the ASCT system to adjust signal timing parameters to account for variations in flow attributable to special events, seasonal flows, incidents, or simply the increase of volumes over time. In this case, signal timings are not pre-defined based on historic data, so ASCT systems can potentially reduce delays created by outdated static TOD plans. These pilot deployments were evaluated to determine if ASCT created operational and safety improvements large enough to justify the additional costs to install ASCT. Data on mainline traffic operations, side street delays, and intersection crashes were collected with and without ASCT active. The results showed that mainline traffic operations generally improved if (1) the corridor was not oversaturated; (2) the corridor did not have characteristics that encourage platoon dispersion; and (3) the corridor did not already function well. Side street delays generally increased, although net benefits in overall corridor travel time were usually still observed. An empirical Bayes safety analysis of crashes at the intersections where ASCT was installed also found a 17% decrease in total crashes. Overall, ASCT generally produced a favorable benefit/cost ratio. The findings from the pilot tests were used to identify key considerations for future ASCT deployments so that VDOT could better identify future sites that might benefit from ASCT installation.
Author : Michael D. Fontaine
Publisher :
ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (913 download)
Download or read book Evaluation of the Virginia Department of Transportation Adaptive Signal Control Technology Pilot Project written by Michael D. Fontaine and published by . This book was released on 2015 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, most traffic signals operated by the Virginia Department of Transportation (VDOT) use actuated plans that vary by time of day (TOD) and day of the week. These timing plans are typically developed off-line using traffic count information collected in the field and then processed using signal optimization software. This method works well as long as traffic volumes remain consistent with the conditions used to develop the timing plan, but timing plans can become suboptimal if traffic demands deviate from those conditions. Traffic growth over time, seasonal changes in traffic, special events, or incidents can all cause TOD plans to perform poorly, resulting in increased delays to drivers. As a result, VDOT must regularly retime signalized intersections to deal with long-term changes in travel patterns, which incurs costs to VDOT. Even so, non-recurring events can still cause TOD plans to perform poorly. Adaptive signal control technology (ASCT) is one tool that has been proposed to handle variable traffic demand better. VDOTs Traffic Engineering Division began a pilot program to install the InSync ASCT developed by Rhythm Engineering on 13 corridors around the state beginning in 2011. The InSync system uses enhanced detection along a corridor to adjust signal timing parameters dynamically to meet observed demand in real time, eliminating the need to develop static timing plans. This allows the ASCT system to adjust signal timing parameters to account for variations in flow attributable to special events, seasonal flows, incidents, or simply the increase of volumes over time. In this case, signal timings are not pre-defined based on historic data, so ASCT systems can potentially reduce delays created by outdated static TOD plans. These pilot deployments were evaluated to determine if ASCT created operational and safety improvements large enough to justify the additional costs to install ASCT. Data on mainline traffic operations, side street delays, and intersection crashes were collected with and without ASCT active. The results showed that mainline traffic operations generally improved if (1) the corridor was not oversaturated; (2) the corridor did not have characteristics that encourage platoon dispersion; and (3) the corridor did not already function well. Side street delays generally increased, although net benefits in overall corridor travel time were usually still observed. An empirical Bayes safety analysis of crashes at the intersections where ASCT was installed also found a 17% decrease in total crashes. Overall, ASCT generally produced a favorable benefit/cost ratio. The findings from the pilot tests were used to identify key considerations for future ASCT deployments so that VDOT could better identify future sites that might benefit from ASCT installation.
Author : Peter S. Parsonson
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.3/5 (555 download)
Download or read book Signal Timing Improvement Practices written by Peter S. Parsonson and published by . This book was released on 1992 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to traffic engineers, public officials, and others interested in developing improved traffic signal timing procedures. Information has been assembled on traffic signal timing software, resources required for timing, procedures for single intersections and coordinated systems, pedestrian intervals, and fine- tuning solutions. Traffic engineers need to know the comparative requirements and effectiveness of alternative traffic signal timing techniques. This report of the Transportation Research Board describes these techniques, presents the general principles for application, including source material for more detailed information, and discusses the issues associated with traffic signal timing alternatives. It should be noted that, while traffic engineers frequently use standards developed by the American Association of State Highway and Transportation Officials, the Federal Highway Administration, or other agencies in making engineering judgments, they are always well advised to protect themselves by carefully supporting the bases of their decisions with factual findings and documenting the reasons for the decisions.
Author : Edmond Chin-Ping Chang
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (91 download)
Download or read book Arterial Signal Timing Optimization Using PASSER II-90 written by Edmond Chin-Ping Chang and published by . This book was released on 1991 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edmond Chin-Ping Chang
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.3/5 (555 download)
Download or read book Arterial Signal Timing Optimization Using PASSER II-87 written by Edmond Chin-Ping Chang and published by . This book was released on 1988 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Seli James Agbolosu-Amison
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.3/5 (555 download)
Download or read book Performance Evaluation of Dynamic Gap-out Feature Using Stochastic Optimization Method and Software in the Loop Simulation written by Seli James Agbolosu-Amison and published by . This book was released on 2008 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.3/5 (555 download)
Download or read book Course Catalog written by and published by . This book was released on 1994 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.3/5 (91 download)
Download or read book Signals, Traffic Software, and Lighting: Courses and Basic References written by and published by . This book was released on 1988 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (555 download)
Download or read book Software for Timing Signalized Arterials written by and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
