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Book Assessment of Optimality of Arterial Signal Timing Plans Under Diurnal and Day to day Variations in Traffic Demand

Download or read book Assessment of Optimality of Arterial Signal Timing Plans Under Diurnal and Day to day Variations in Traffic Demand written by Marija Ostojic and published by . This book was released on 2015 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most U.S. urban traffic signal systems deploy multiple signal timing plans to account for daily variability of traffic demand (i.e. morning peak, midday, afternoon peak, off peak and night). Groups of signals (belonging to the one zone or section) along an urban arterial, usually operate in a coordinated manner. This essentially means that timing plans change at the same time for all the signals in the group, so as to facilitate vehicle progression of through a series of signals. Good traffic signal timing practices assume a certain level of monitoring and maintenance in order to guarantee that they are efficient in servicing current traffic conditions. When investigating signal control optimality the most significant evidence to consider is intersection/approach traffic volume. Availability of traffic data is crucial when examining the robustness of signal timing plans for varying daily demand. Flexibility of field signal timing plans to handle day to day and daily traffic demand fluctuations determines whether the designed/optimized signal plan is appropriate/optimal. The purpose of this study is to establish the methodology to examine the ability of currently deployed signal timing plans to serve traffic demands' diurnal and day-to-day fluctuations, and based on traffic volumes, identify appropriate TOD breakpoints. A methodology developed in this research study is intended to assist traffic signal engineers and operators in developing more robust timing plans which operate well over a broader range of daily and day-to-day demand conditions. This study, also, investigates various methods to identify TOD breakpoints and optimal number of signal timing plans based on the significant amount of collected traffic data. This research included developing an auto-spreadsheet which would enable traffic operators/engineers to observe and evaluate the latest changes in daily demand and based on the historical hourly volumes and identify the most appropriate signal timing plan for the corresponding demand.

Book Traffic Signal Timing Manual

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.

Book Improving Signal Timing Volume 2 Pretimed Arterial Roadways Final Report

Download or read book Improving Signal Timing Volume 2 Pretimed Arterial Roadways Final Report written by Marthinus Joachim Vermeulen and published by . This book was released on 1984 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Signal Timing Manual

Download or read book Signal Timing Manual written by Thomas Urbanik and published by . This book was released on 2015 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 812: Signal Timing Manual - Second Edition, covers fundamentals and advanced concepts related to signal timing. The report addresses ways to develop a signal timing program based on the operating environment, users, user priorities by movement, and local operational objectives. Advanced concepts covered in the report include the systems engineering process, adaptive signal control, preferential vehicle treatments, and timing strategies for over-saturated conditions, special events, and inclement weather. An overview PowerPoint presentation accompanies the report." --

Book Traffic Signal Retiming Practices in the United States

Download or read book Traffic Signal Retiming Practices in the United States written by Robert L. Gordon and published by Transportation Research Board. This book was released on 2010 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 409: Traffic Signal Retiming Practices in the United States explores practices that operating agencies currently use to revise traffic signal timing. The report examines the processes used to develop, install, verify, fine-tune, and evaluate the plans--

Book Investigation of Schedules for Traffic Signal Timing Optimization

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.

Book Pretimed Control of Arterial Traffic Signal Systems

Download or read book Pretimed Control of Arterial Traffic Signal Systems written by Marthinus Joachim Vermeulen and published by . This book was released on 1984 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manual signal timing guidelines for arterial streets with pretimed traffic controllers tested through laboratory simulation using TRANSYT.

Book Transportation Research Record

Download or read book Transportation Research Record written by and published by . This book was released on 1988 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book HRIS Abstracts

Download or read book HRIS Abstracts written by and published by . This book was released on 1988 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Statistically Based Acceptance Procedures Quality Assurance and Construction Management

Download or read book Statistically Based Acceptance Procedures Quality Assurance and Construction Management written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1986 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Methodology for Traffic Signal Timing in Oversaturated Arterial Networks

Download or read book Methodology for Traffic Signal Timing in Oversaturated Arterial Networks written by Gye-Hyeong Ahn and published by . This book was released on 1997 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: A traffic simulation model was developed to provide a methodology for traffic signal timing in oversaturated urban arterial networks. Two control objectives of traffic signal timing in oversaturated conditions were taken into consideration. One was to maximize the number of vehicles processed in an arterial network, which has an oversaturated traffic demand at the entry of the arterial street and moderate traffic demands at the entry of cross streets. The other was to prevent queue spillback or to minimize the occurrence of queue spillback if inevitable. Signal timing offset was the dominant factor affecting system performance; although, link length was also important. When link length is short, the optimum offset is approximately zero, regardless of the cycle length. As link length increases beyond the minimum 200 ft (61 m) tested, for highest efficiency, downstream intersection greens should begin before upstream intersection greens. This relationship, opposite to conventional progression greens, moves downstream queues before incoming platoon arrival. Cross street traffic operations can have significant effects upon arterial performance and system efficiency. System efficiency rapidly deteriorates when any cross street green becomes too short for the link length. Therefore, a "practical" minimum green interval for cross streets is necessary to accommodate upstream cross street through traffic and turning vehicles from the arterial. When the cross street green is shorter than the minimum, even with the best offset combination, queue spillbacks occur on the cross streets and system efficiency deteriorates.

Book Quantifying Benefits of Traffic Signal Retiming

Download or read book Quantifying Benefits of Traffic Signal Retiming written by Christopher M. Day and published by . This book was released on 2010-10-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Development of Algorithms for Travel Time based Traffic Signal Timing

Download or read book Development of Algorithms for Travel Time based Traffic Signal Timing written by Henry X. Liu and published by . This book was released on 2010 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: "As technologies continue to mature, the concept of IntelliDrive has gained significant interest. Besides its application on traffic safety, IntelliDrive also has great potential to improve traffic operations. In this context, an interesting question arises: If the trajectories of a small percentage of vehicles (IntelliDrive vehicles) can be measured in real time, how can we use such data to improve traffic management? This research serves as a starting point that aims to produce a paradigm shift to optimize the traffic signal control from the use of the conventional fixed-point loop detector data to the use of mobile vehicle trajectory-based data. Since the change of density on arterials can help traffic engineers to track the queue length at intersections, which is important for traffic signal optimization, in this project we will focus on the estimation of traffic density on urban arterials when trajectories from a small percentage of vehicles are available. Most previous work, however, focuses on freeway density estimation based merely on detector data. In this research, we adopt the MARCOM (Markov Compartment) model developed by Davis and Kang (1994) to describe arterial traffic states. We then implement a hybrid extended Kalman filter to integrate the approximated MARCOM with fixed-point and vehicle-trajectory measurements. We test the proposed model on a single signal link simulated using VisSim. Test results show that the hybrid extended Kalman filter with vehicle-trajectory data can significantly improve density estimation"--Technical report documentation page.