Left Turn Treatments At Intersections
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Left Turn Treatments At Intersections
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Author : James L. Pline
language : en
Publisher: Transportation Research Board
Release Date : 1996
Left Turn Treatments At Intersections written by James L. Pline and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Controlled access highways categories.
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.
Guidelines For Left Turn Treatments At Signal Controlled Intersections
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Author : Zoltan Anthony Nemeth
language : en
Publisher:
Release Date : 1984
Guidelines For Left Turn Treatments At Signal Controlled Intersections written by Zoltan Anthony Nemeth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Left-turn lanes categories.
Impacts On Safety Of Left Turn Treatment At High Speed Signalized Intersections
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Author : T. H. Maze
language : en
Publisher:
Release Date : 1994
Impacts On Safety Of Left Turn Treatment At High Speed Signalized Intersections written by T. H. Maze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Left-turn lanes categories.
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.
Left Turn Treatments At Signalized Intersections Without Turn Slots
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Author : Mark J. Smith
language : en
Publisher:
Release Date : 1983
Left Turn Treatments At Signalized Intersections Without Turn Slots written by Mark J. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Roads categories.
Capacity And Operational Effects Of Midblock Left Turn Lanes
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Author : James A. Bonneson
language : en
Publisher: Transportation Research Board
Release Date : 1997
Capacity And Operational Effects Of Midblock Left Turn Lanes written by James A. Bonneson and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Technology & Engineering categories.
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.
Guidelines For Right Turn Treatments At Unsignalized Intersections And Driveways
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Author : Tanweer Hasan
language : en
Publisher:
Release Date : 1996
Guidelines For Right Turn Treatments At Unsignalized Intersections And Driveways written by Tanweer Hasan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Driveways categories.
Guidelines for right-turn treatments at unsignalized intersections and driveways on the state highway system of Kansas were developed in this study. Two types of treatments, full-width lane and taper, were considered over the do-nothing radius treatment. THe guidelines were based on the results of an economic analysis conducted over a wide range of traffic volumes and speeds. A simple model was developed to determine the operational effects of right-turn movements at unsignalized intersections and driveways on high-speed highways. The operational effects were estimated in terms of delay and excess fuel consumption experienced by through vehicles due to the right turns. The relationship between speed differential and accidents was used to estimate the reduction in right-turn same direction rear-end accidents that would be expected to result from the provision of a right-turn treatment. Comparison with other guidelines and validation of existing right-turn treatments at the study sites indicate that the range of the guidelines developed in this study isre reasonable. They are also more definitive because they consider highway operating speed. They are more flexible in determining an appropriate treatment because an intermediate taper treatment is considered.
Safety Effects Of Left Turn Treatments At Intersections On Urban Four Lane Roadways
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Author : Michael S. Malone
language : en
Publisher:
Release Date : 1988
Safety Effects Of Left Turn Treatments At Intersections On Urban Four Lane Roadways written by Michael S. Malone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Left Turn Accommodations At Unsignalized Intersections
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Author : Kay Fitzpatrick
language : en
Publisher: Transportation Research Board
Release Date : 2013
Left Turn Accommodations At Unsignalized Intersections written by Kay Fitzpatrick and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Left-turn lanes categories.
"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.
Evaluation Of Sign And Marking Alternatives For Displaced Left Turn Lane Intersections
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Author :
language : en
Publisher:
Release Date : 2009
Evaluation Of Sign And Marking Alternatives For Displaced Left Turn Lane Intersections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Left-turn lanes categories.
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.
Guidelines For Left Turn Treatments At Signal Controlled Intersections
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Author :
language : en
Publisher:
Release Date : 1984
Guidelines For Left Turn Treatments At Signal Controlled Intersections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
