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Methods Of Safety Improvements At Coordinated Signals
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Book Synopsis Methods of Safety Improvements at Coordinated Signals by : Wei Li
Download or read book Methods of Safety Improvements at Coordinated Signals written by Wei Li and published by Purdue University Press. This book was released on 2008-01-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, the safety impact of arterial signal coordination is investigated. Based on the findings, procedures are proposed to incorporate safety considerations into signal coordination design. In addition, a software tool is developed to facilitate the use of the research findings. Signal coordination has been extensively employed as a tool to optimize an arterial system's mobility performance, commonly measured by the total number of vehicle stops and the time of delays. Although vehicle crashes at signalized intersections have long been recognized as a major safety threat, studies to date have been limited locally to non-coordinated signals or the noncoordinated features of signal timings. Disaggregate statistical models are developed to identify the influential crash likelihood factors of rear-end and right-angle crashes, the two most frequent types of intersection crashes. To capture the severity factors, the outcomes are further classified into property-damage-only (PDO) and injury-fatal (IF) crashes. The crash likelihoods for each 15-minute interval are used as the response variables of the models. For each 15-minute interval, predictive variables are collected or derived from available data, including the volume, signal timings, and traffic patterns. A traffic pattern characterization is designed to represent each 15-minute interval's arrival pattern. The key findings are as follows: First, signal coordination significantly affects crash likelihood. Certain traffic arrival patterns are associated with significantly lower crash likelihoods. Second, the dilemma zone contributes in a limited way to the crash likelihoods. Third, adjusted volumes, based on the presented models, were found to be better predictors of crash likelihoods, which indicates that only a portion of all vehicles are highly susceptible to crashes. Fourth, shorter distances from upstream intersection and shorter cycle lengths are associated with lower risk levels of crashes.
Book Synopsis Evaluating the Safety Effects of Signal Improvements by : Ashley L. Dowell
Download or read book Evaluating the Safety Effects of Signal Improvements written by Ashley L. Dowell and published by . This book was released on 2013 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a result of high crash frequencies on roadways, transportation safety has become a high priority for the United States Department of Transportation and the Utah Department of Transportation. A large percentage of fatal and injury crashes on roadways occur at intersections and traffic signals have been implemented to reduce these severe crashes. There is a need to evaluate the effectiveness of the traffic signal improvements through the development of Crash Modification Factors (CMFs). Recent research has shown that traditional safety evaluation methods have been inadequate in developing CMFs. In recent years, Bayesian statistical methods have been utilized in traffic safety studies to more accurately analyze the effectiveness of safety improvements. The hierarchical Bayesian method is an advanced statistical technique that has the capability to account for the shortcomings of traditional methods and to more fully reflect the effectiveness of safety improvements.
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 Evaluation of Innovative Coordination Methods Utilizing ITS Technology for Traffic Signals by : Steven P. Venglar
Download or read book Evaluation of Innovative Coordination Methods Utilizing ITS Technology for Traffic Signals written by Steven P. Venglar and published by . This book was released on 1997 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project report summaries research and implementation of signal system communications and improved signal control. An investigation of available signal system communication technologies and media identified spread spectrum radio as an effective, inexpensive, and flexible alternative. As part of the project, a radio communications system was selected and installed at five signalized intersections along US 281 in Falfurrias, Texas. Closed loop system software was then installed to coordinate the previously isolated, actuated intersections. The end result was improved traffic control, improved traffic flow, and remote system monitoring for those responsible for signal maintenance. A second aspect of the project focused on developing real-time control functionality that would make use of the communications system. The Texas Department of Transportation's Dynamic Arterial Responsive Traffic System (DARTS) Specification provided a public domain, real-time signal coordination algorithm that suited this purpose. Simulators were developed by the Texas Transportation Institute to determine the effectiveness of DARTS installed in Falfurrias. Results show an average 18 percent reduction in travel time on US 281 and indicate the potential for DARTS to reduce arterial travel time. As an added project benefit, the simulation software developed for this project can be used to determine DARTS applicability at any given field site, and it can be used to train personnel in DARTS use and calibration.
Book Synopsis Federally Coordinated Program of Highway Research, Development and Technology by :
Download or read book Federally Coordinated Program of Highway Research, Development and Technology written by and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Innovative Intersection Safety Improvement Strategies and Management Practices by : Warren Edward Hughes
Download or read book Innovative Intersection Safety Improvement Strategies and Management Practices written by Warren Edward Hughes and published by . This book was released on 2006 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Federally Coordinated Program of Highway Research and Development by :
Download or read book Federally Coordinated Program of Highway Research and Development written by and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Dept. of Transportation. Grade Crossing Safety Task Force Publisher : ISBN 13 : Total Pages :148 pages Book Rating :4.:/5 (31 download)
Book Synopsis Implementation Report of the USDOT Grade Crossing Safety Task Force by : United States. Dept. of Transportation. Grade Crossing Safety Task Force
Download or read book Implementation Report of the USDOT Grade Crossing Safety Task Force written by United States. Dept. of Transportation. Grade Crossing Safety Task Force and published by . This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Green Transportation and Low Carbon Mobility Safety by : Wuhong Wang
Download or read book Green Transportation and Low Carbon Mobility Safety written by Wuhong Wang and published by Springer Nature. This book was released on 2022-10-27 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings gather selected papers from the 12th International Conference on Green Intelligent Transportation Systems and Safety, held in Beijing, China on November 17-19, 2021. The book contains cutting-edge research on Green Intelligent Mobility Systems, with the goal of achieving "green, intelligent, and safe transportation systems" as the guiding slogan. The contributions offered here can aid in the advancement of green mobility and intelligent transportation technology by increasing interconnectivity, resource sharing, flexibility, and efficiency. Researchers and engineers in the areas of Transportation Technology and Traffic Engineering, Automotive and Mechanical Engineering, Industrial and System Engineering, and Electrical Engineering will all benefit from the book's scope.
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 Engineering Economic Analysis Practices for Highway Investment by : Michael J. Markow
Download or read book Engineering Economic Analysis Practices for Highway Investment written by Michael J. Markow and published by Transportation Research Board. This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 424: Engineering Economic Analysis Practices for Highway Investment explores how U.S. transportation agencies have applied engineering economics--benefit–cost analyses and similar procedures--to decisions on highway investments.
Book Synopsis Proceedings of the Regional Highway Research and Development Conferences, San Francisco, Atlantic City, Columbus, Kansas City by : United States. Bureau of Public Roads
Download or read book Proceedings of the Regional Highway Research and Development Conferences, San Francisco, Atlantic City, Columbus, Kansas City written by United States. Bureau of Public Roads and published by . This book was released on 1963 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Regional Highway Research and Development Conferences, San Francisco, [etc.], 1963 by :
Download or read book Proceedings of the Regional Highway Research and Development Conferences, San Francisco, [etc.], 1963 written by and published by . This book was released on 1963 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Report on the Status of the Federal-aid Highway Program, Hearing Before the Subcommittee on Roads ... 91-2 by : United States. Congress. Senate. Committee on Public Works
Download or read book Report on the Status of the Federal-aid Highway Program, Hearing Before the Subcommittee on Roads ... 91-2 written by United States. Congress. Senate. Committee on Public Works and published by . This book was released on 1970 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Public Works. Subcommittee on Roads Publisher : ISBN 13 : Total Pages :208 pages Book Rating :4.:/5 (6 download)
Book Synopsis Report on the Status of the Federal-aid Highway Program by : United States. Congress. Senate. Committee on Public Works. Subcommittee on Roads
Download or read book Report on the Status of the Federal-aid Highway Program written by United States. Congress. Senate. Committee on Public Works. Subcommittee on Roads and published by . This book was released on 1970 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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