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Author : Mark J. Smith
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.3/5 (91 download)
Download or read book Left Turn Treatments at Signalized Intersections Without Turn Slots written by Mark J. Smith and published by . This book was released on 1983 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James L. Pline
Publisher : Transportation Research Board
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.3/5 (555 download)
Download or read book Left-turn Treatments at Intersections written by James L. Pline and published by Transportation Research Board. This book was released on 1996 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to traffic engineers in both the public and private sectors, as well as to design engineers, safety and law enforcement officials, traffic signal technicians, and others concerned with the accommodation of nonmotorized transportation (pedestrians and bicycles) on the roadway. The synthesis describes the traffic conditions, signalization, signing, and geometric design issues associated with accommodating left-turning vehicles at intersections. This report of the Transportation Research Board discusses the basic concerns related to left-turn movements and the guidelines and requirements for handling these movements in the traffic stream. It also addresses the design criteria for left-turn treatments and the performance measures frequently applied to determine their effectiveness. The synthesis discusses the specific requirements for signing and pavement markings, and the various elements of traffic signal requirements, signal design and installation, phasing optimization, and lane-use controls. There is also a description of special applications such as U-turn control, pedestrian requirements, bicycles, and light rail transit interface.
Author :
Publisher :
ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.3/5 (555 download)
Download or read book Federally Coordinated Program of Highway Research, Development and Technology written by and published by . This book was released on 1984 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zoltan Anthony Nemeth
Publisher :
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.3/5 (555 download)
Download or read book Guidelines for Left-turn Treatments at Signal Controlled Intersections written by Zoltan Anthony Nemeth and published by . This book was released on 1984 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.3/5 (91 download)
Download or read book Federally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1985 written by and published by . This book was released on 1986 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kay Fitzpatrick
Publisher : Transportation Research Board
ISBN 13 : 0309258987
Total Pages : 62 pages
Book Rating : 4.3/5 (92 download)
Download or read book Left-turn Accommodations at Unsignalized Intersections written by Kay Fitzpatrick and published by Transportation Research Board. This book was released on 2013 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 745: Left-Turn Accommodations at Unsignalized Intersections presents guidance for the selection and design of left-turn accommodations at unsignalized intersections. The report includes 11 case studies of typical situations that illustrate the use of the guidance." -- publisher's description.
Author : T. H. Maze
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.3/5 (555 download)
Download or read book Impacts on Safety of Left-turn Treatment at High Speed Signalized Intersections written by T. H. Maze and published by . This book was released on 1994 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Left-turning traffic is a major source of conflicts at intersections. Though an average of only 10% to 15% of all approach traffic turns left, these vehicles are involved in approximately 45% of all accidents. This report presents the results of research conducted to develop models which estimate approach accident rates at high speed signalized intersections. The objective of the research was to quantify the relationship between traffic and intersection characteristics, and accident potential of different left turn treatments. Geometric, turning movement counts, and traffic signal phasing data were collected at 100 intersections in Iowa using a questionnaire sent to municipalities. Not all questionnaires resulted in complete data and ultimately complete data were derived for 63 intersections providing a database of 248 approaches. Accident data for the same approaches were obtained from the Iowa Department of Transportation Accident Location and Analysis System (ALAS). Regression models were developed for two different dependent variables: 1) the ratio of the number of left turn accidents per approach to million left turning vehicles per approach, and 2) the ratio of accidents per approach to million traffic movements per approach. A number of regression models were developed for both dependent variables. One model using each dependent variable was developed for intersections with low, medium, and high left turning traffic volumes. As expected, the research indicates that protected left turn phasing has a lower accident potential than protected/permitted or permitted phasing. Left turn lanes and multiple lane approaches are beneficial for reducing accident rates, while raised medians increase the likelihood of accidents. Signals that are part of a signal system tend to have lower accident rates than isolated signals. The resulting regression models may be used to determine the likely impact of various left turn treatments on intersection accident rates. When designing an intersection approach, a traffic engineer may use the models to estimate the accident rate reduction as a result of improved lane configurations and left turn treatments. The safety benefits may then be compared to any costs associated with operational effects to the intersection (i.e., increased delay) to determine the benefits and costs of making intersection safety improvements.
Author : Daniel B. Fambro
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (555 download)
Download or read book Guidelines for Signalized Left-turn Treatments written by Daniel B. Fambro and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. J. Lin
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.3/5 (555 download)
Download or read book Guidelines for Use of Left-turn Lanes and Signal Phases written by H. J. Lin and published by . This book was released on 1984 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James A. Bonneson
Publisher : Transportation Research Board
ISBN 13 : 9780309060677
Total Pages : 148 pages
Book Rating : 4.0/5 (66 download)
Download or read book Capacity and Operational Effects of Midblock Left-turn Lanes written by James A. Bonneson and published by Transportation Research Board. This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research project was to develop a methodology for evaluating alternative midblock left-turn treatments on urban and suburban arterials. The methodology had to be applicable to three common midblock left-turn treatments: the raised-curb median, the flush median with two-way left-turn lane (TWLTL) delineation, and the undivided cross section. The methodology developed for this research focuses on the evaluation of midblock street segments on urban and suburban arterials. The basis for NCHRP Report 395.
Author :
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.3/5 (91 download)
Download or read book Highway Safety 1984. A Report on Activities Under the Highway Safety Act of 1966. January 1, 1984 - December 31, 1984 written by and published by . This book was released on 1987 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.3/5 (555 download)
Download or read book Development of Left-turn Lane Guidelines for Signalized and Unsignalized Intersections written by and published by . This book was released on 2004 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is generally accepted that the level of service (LOS) at intersections significantly affects the overall LOS of the road system. It is also known that the LOS at an intersection can be adversely affected by frequently allowing left-turning vehicles to block through traffic. In addition, crash rates tend to be higher at intersections than on through sections of a road. The separation of left-turning vehicles from through traffic is therefore an important condition for the safe and effective operation of intersections. Existing guidelines for installing left-turn lanes have several limitations. They are mainly based on the traffic volumes at the intersection, and they use deterministic models with fixed gap acceptance and/or left-turn maneuver times. In addition, the guidelines for left-turn lanes for unsignalized intersections and signalized intersections must be specific for the type of intersection. In this study, new left-turn guidelines for both unsignalized and signalized intersections were developed on the basis of well-validated event-based simulation programs. Guidelines for unsignalized intersections were based on the percentage of left turns blocking through vehicles, whereas the guidelines for signalized intersections were developed using a minimum left-turn volume of either 85% left-turn capacity or LOS E delay (55 seconds/vehicle). In addition to the general guidelines, a prioritization tool that can be used to prioritize candidate intersections was developed. The prioritization tool accounts for both operational and safety aspects.
Author : Lee August Rodegerdts
Publisher :
ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.3/5 (555 download)
Download or read book Signalized Intersections written by Lee August Rodegerdts and published by . This book was released on 2004 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide provides a single, comprehensive document with methods for evaluating the safety and operations of signalized intersections and tools to remedy deficiencies. The treatments in this guide range from low-cost measures such as improvements to signal timing and signage, to high-cost measures such as intersection reconstruction or grade separation. Topics covered include fundamental principles of user needs, geometric design, and traffic design and operation; safety and operational analysis techniques; and a wide variety of treatments to address existing or projected problems, including individual movements and approaches, pedestrian and bicycle treatments, and corridor techniques. It also covers alternative intersection forms that improve intersection performance through the use of indirect left turns and other treatments. Each treatment includes a discussion of safety, operational performance, multimodal issues, and physical and economic factors that the practitioner should consider. Although the guide focuses primarily on high-volume signalized intersections, many treatments are applicable for lower volume intersections as well. The information contained in this guide is based on the latest research available on treatments and best practices in use by jurisdictions across the United States. Additional resources and references are highlighted for the student, practitioner, researcher, or decisionmaker who wishes to learn more about a particular subject.
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.3/5 (555 download)
Download or read book Triple Left-turn Lanes at Signalized Intersections written by and published by . This book was released on 2002 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael A. Perfater
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.3/5 (555 download)
Download or read book An Assessment of Exclusive/permissive Left-turn Signal Phasing written by Michael A. Perfater and published by . This book was released on 1982 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than 70% of motorists returning a questionnaire distributed for the study favored the exclusive/permissive signal, while about 17% said the signal reduced delays, and 30% said it created a hazard. Intersections with one or more right-turn-on-red movements seemed especially susceptible to vehicular conflicts. The ratios of accidents involving left-turning vehicles to all accidents at intersections appeared to increase after the E/P signals were installed.
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of Sign and Marking Alternatives for Displaced Left-turn Lane Intersections written by and published by . This book was released on 2009 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes research conducted by the Federal Highway Administration (FHWA) to support guidance on the signing and marking of displaced left turn lane intersections (DLT) also known as continuous flow intersections (CFI). The DLT is an at grade intersection that is intended to support high traffic flow where there is a large volume of left turns and heavy through volumes. Its design permits the use of two or three phase traffic signals at the junction of two roads, while still providing at grade protected left turn movements.
Author : Joseph E. Hummer
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.3/5 (555 download)
Download or read book An Evaluation of Leading Versus Lagging Left Turn Signal Phasing written by Joseph E. Hummer and published by . This book was released on 1989 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
