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Signal Timing And Coordination Strategies Under Varying Traffic Demands
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Book Synopsis Signal Timing and Coordination Strategies Under Varying Traffic Demands by : Rasool Andalibian
Download or read book Signal Timing and Coordination Strategies Under Varying Traffic Demands written by Rasool Andalibian and published by . This book was released on 2012 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current practice for signal timing and signal coordination is to develop and operate a limited number of predetermined time-of-day plans. Coordination plans are commonly developed for and based on weekday morning, mid-day, evening, and weekend peak periods. During the remaining time periods signals are operating either in fully/semi-actuated modes or fixed modes. Engineers often face a dilemma to decide when signals should be coordinated. This project aims at developing quantitative guidelines. One of the most significant benefits of signal coordination is the reduction of number of stops which has received less attention in previous studies. First, a probabilistic model that predicts the expected number of stops on non-coordinated arterials was developed. The model was validated through VISSIM simulation of a real signalized arterial, Sparks Blvd. in Sparks, Nevada. The results confirmed that the model was highly reliable in estimating the number of stops. Based on the probabilistic model, a practical signal timing guideline was developed according to the percentage of stops on non-coordinated arterials. Finally, a case study was conducted to demonstrate the application of the guideline. The same Sparks Blvd. arterial was used in the case study but with various traffic demand conditions. The case study confirmed the practicality of guideline.
Book Synopsis Traffic Signal Timing Manual by : U.s. Department of Transportation
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 Synopsis Improved Traffic Signal Coordination Strategies for Actuated Control by : Carroll J. Messer
Download or read book Improved Traffic Signal Coordination Strategies for Actuated Control written by Carroll J. Messer and published by . This book was released on 1996 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents research conducted to develop better strategies to use with traffic actuated control in coordinated signal systems. Recommendations are presented on more efficient strategies for coordination using actuated control. Representative arterial traffic control problems were modeled into a statistical testbed using TRAF-NETSIM. A set of scenarios covering a range of arterial geometry, traffic volumes and traffic actuated control settings were tested and evaluated. PASSER II-90 was used to develop base signal timing plans. Chapter One describes the various objectives that were intended to be achieved by this research. It also discusses signal coordination strategies for actuated control. Chapter Two presents the background information and various traffic engineering simulation models available for use in this study. Chapters Three and Four explain the study methodology adopted for this research and the results obtained for the various study scenarios, respectively. Chapter Five presents the conclusions and recommendations of the research.
Book Synopsis Traffic Control Systems Handbook by :
Download or read book Traffic Control Systems Handbook written by and published by . This book was released on 1976 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook, which was developed in recognition of the need for the compilation and dissemination of information on advanced traffic control systems, presents the basic principles for the planning, design, and implementation of such systems for urban streets and freeways. The presentation concept and organization of this handbook is developed from the viewpoint of systems engineering. Traffic control studies are described, and traffic control and surveillance concepts are reviewed. Hardware components are outlined, and computer concepts, and communication concepts are stated. Local and central controllers are described, as well as display, television and driver information systems. Available systems technology and candidate system definition, evaluation and implementation are also covered. The management of traffic control systems is discussed.
Book Synopsis Traffic and Transportation Studies 2010: Proceedings of the 7th International Conference on Traffic and Transportation Studies, August 3-5, 2010, Kunming, China (Proceedings of the 7th International C. by : Ziyou Gao
Download or read book Traffic and Transportation Studies 2010: Proceedings of the 7th International Conference on Traffic and Transportation Studies, August 3-5, 2010, Kunming, China (Proceedings of the 7th International C. written by Ziyou Gao and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coordination of Traffic Signals in Networks and Related Graph Theoretical Problems on Spanning Trees by : Gregor Wünsch
Download or read book Coordination of Traffic Signals in Networks and Related Graph Theoretical Problems on Spanning Trees written by Gregor Wünsch and published by Cuvillier Verlag. This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessment of Optimality of Arterial Signal Timing Plans Under Diurnal and Day-to-day Variations in Traffic Demand by : Marija Ostojic
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 Synopsis Pedestrian Facilities Users Guide: Providing Safety and Mobility by : Charles V. Zegeer
Download or read book Pedestrian Facilities Users Guide: Providing Safety and Mobility written by Charles V. Zegeer and published by DIANE Publishing. This book was released on 2002 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide is intended to provide information on how to identify safety and mobility needs for pedestrians with the roadway right-of-way. Useful for engineers, planners, safety professionals and decision-makers, the guide covers such topics as: the Walking Environment including sidewalks, curb ramps, crosswalks, roadway lighting and pedestrian over and under passes; Roadway Design including bicycle lanes, roadway narrowing, reducing the number of lanes, one-way/two-way streets, right-turn slip lanes and raised medians; Intersections with roundabouts, T-intersections and median barriers; and Traffic calming designs.
Book Synopsis Traffic Signal Retiming Practices in the United States by : Robert L. Gordon
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 Synopsis Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling by : Imad L. Al-Qadi
Download or read book Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling written by Imad L. Al-Qadi and published by CRC Press. This book was released on 2008-11-01 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internationally, significant attention is given to transport sustainability including planning, design, construction, evaluation, safety and durability of the road system. The 4th International Gulf Conference on Roads: Efficient Transportation and Pavement Systems - Characterization, Mechanisms, Simulation, and Modeling, hosted by the University o
Book Synopsis Improved Traffic Signal Efficiency in Rural Areas Through the Use of Variable Maximum Green Time by : Steven M. Click
Download or read book Improved Traffic Signal Efficiency in Rural Areas Through the Use of Variable Maximum Green Time written by Steven M. Click and published by . This book was released on 2007 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Practices on Road Traffic Signal Control by : Keshuang Tang
Download or read book Global Practices on Road Traffic Signal Control written by Keshuang Tang and published by Elsevier. This book was released on 2019-05-03 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global Practices on Road Traffic Signal Control is a valuable reference on the current state-of-the-art of road traffic signal control around the world. The book provides a detailed description of the common principles of road traffic signal control using a well-defined and consistent format that examines their application in countries and regions across the globe. This important resource considers the differences and special considerations across countries, providing useful insights into selecting control strategies for signal timing at intersections and pedestrian crosswalks. The book's authors also include success stories for coping with increasing traffic-related problems, examining both constraints and the reasons behind them. Presents a comprehensive reference on country-by-country practices on road traffic signal control Compiles and compares approaches across countries Covers theories and common principles Examines the most current systems and their implementation
Book Synopsis Analysis of Adaptive Signal Control Strategies in Urban Corridors by : Ahmed Shawky Abdel-Rahim
Download or read book Analysis of Adaptive Signal Control Strategies in Urban Corridors written by Ahmed Shawky Abdel-Rahim and published by . This book was released on 1998 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhanced Traffic Signal Operation Using Connected Vehicle Data by : Ehsan Bagheri
Download or read book Enhanced Traffic Signal Operation Using Connected Vehicle Data written by Ehsan Bagheri and published by . This book was released on 2017 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: As traffic on urban road network increases, congestion and delays are becoming more severe. At grade intersections form capacity bottlenecks in urban road networks because at these locations, capacity must be shared by competing traffic movements. Traffic signals are the most common method by which the right of way is dynamically allocated to conflicting movements. A range of traffic signal control strategies exist including fixed time control, actuated control, and adaptive traffic signal control (ATSC). ATSC relies on traffic sensors to estimate inputs such as traffic demands, queue lengths, etc. and then dynamically adjusts signal timings with the objective to minimize delays and stops at the intersection. Despite, the advantages of these ATSC systems, one of the barriers limiting greater use of these systems is the large number of traffic sensors required to provide the essential information for their signal timing optimization methodologies. A recently introduced technology called connected vehicles will make vehicles capable of providing detailed information such as their position, speed, acceleration rate, etc. in real-time using a wireless technology. The deployment of connected vehicle technology would provide the opportunity to introduce new traffic control strategies or to enhance the existing one. Some work has been done to-date to develop new ATSC systems on the basis of the data provided by connected vehicles which are mainly designed on the assumption that all vehicles on the network are equipped with the connected vehicle technology. The goals of such systems are to: 1) provide better performance at signalized intersections using enhanced algorithms based on richer data provided by the connected vehicles; and 2) reduce (or eliminate) the need for fixed point detectors/sensors in order to reduce deployment and maintenance costs. However, no work has been done to investigate how connected vehicle data can improve the performance of ATSC systems that are currently deployed and that operate using data from traditional detectors. Moreover, achieving a 100% market penetration of connected vehicles may take more than 30 years (even if the technology is mandated on new vehicles). Therefore, it is necessary to provide a solution that is capable of improving the performance of signalized intersections during this transition period using connected vehicle data even at low market penetration rates. This research examines the use of connected vehicle data as the only data source at different market penetration rates aiming to provide the required inputs for conventional adaptive signal control systems. The thesis proposes various methodologies to: 1) estimate queues at signalized intersections; 2) dynamically estimate the saturation flow rate required for optimizing the timings of traffic signals at intersections; and 3) estimate the free flow speed on arterials for the purpose of optimizing offsets between traffic signals. This thesis has resulted in the following findings: 1. Connected vehicle data can be used to estimate the queue length at signalized intersections especially for the purpose of estimating the saturation flow rate. The vehicles' length information provided by connected vehicles can be used to enhance the queue estimation when the traffic composition changes on a network. 2. The proposed methodology for estimating the saturation flow rate is able to estimate temporally varying saturation flow rates in response to changing network conditions, including lane blockages and queue spillback that limit discharge rates, and do so with an acceptable range of errors even at low level of market penetration of connected vehicles. The evaluation of the method for a range of traffic Level of Service (LOS) shows that the maximum observed mean absolute relative error (6.2%) occurs at LOS F and when only 10% of vehicles in the traffic stream are connected vehicles. 3. The proposed method for estimating the Free Flow Speed (FFS) on arterial roads can provide estimations close to the known ground truth and can respond to changes in the FFS. The results also show that the maximum absolute error of approximately 4.7 km/h in the estimated FFS was observed at 10% market penetration rate of connected vehicles. 4. The results of an evaluation of an adaptive signal control system based on connected vehicle data in a microsimulation environment show that the adaptive signal control system is able to adjust timings of signals at intersections in response to changes in the saturation flow rate and free flow speed estimated from connected vehicle data using the proposed methodologies. The comparison of the adaptive signal control system against a fixed time control at 20% and 100% CV market penetration rates shows improvements in average vehicular delay and average number of stops at both market penetration rates and though improvements are larger for 100% CV LMP, approximately 70% of these improvements are achieved at 20% CV LMP.
Book Synopsis Traffic Information and Control by : Ruimin Li
Download or read book Traffic Information and Control written by Ruimin Li and published by . This book was released on 2020 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Traffic Signal Timing Models for Oversaturated Signalized Interchanges by : Youngchan Kim
Download or read book Traffic Signal Timing Models for Oversaturated Signalized Interchanges written by Youngchan Kim and published by . This book was released on 1992 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research report documents the development models for control of signalized diamond interchanges during oversaturated traffic conditions. Oversaturated traffic conditions occur when the average traffic demand exceeds the capacity of the signal system. The dynamic optimization model proposed is the principal product of this research. The control objective of the dynamic model is to provide maximum system productivity as well as minimum delay for a selected roadway system. A special feature predetermined upper limits.
Book Synopsis Evaluation of Signal Timing and Coordination Procedures by : E. D. Arnold
Download or read book Evaluation of Signal Timing and Coordination Procedures written by E. D. Arnold and published by . This book was released on 1985 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a review of available literature, recommended procedures for timing the various types of signals are provided. Specifically, procedures are included for both pretimed and vehicle-actuated controllers located at isolated intersections and at intersections in a signal system. Simplicity and ease of use are emphasized as the targeted users are field technicians and those responsible for signals in small cities and towns. A separate Field Manual has been prepared which is intended to provide a concise and easily applied set of procedures. Detailed theory and logic behind the procedures are provided in the Technical Report, as are brief descriptions of current computer programs which provide timing information. The Technical Report also presents the results of a questionnaire survey which had the objective of determining the types of signal equipment used in Virginia.
