Safety Effectiveness Of Intersection Left And Right Turn Lanes

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Safety Effectiveness of Intersection Left- and Right-turn Lanes

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Author : Douglas W. Harwood
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Safety Effectiveness of Intersection Left- and Right-turn Lanes by : Douglas W. Harwood

Download or read book Safety Effectiveness of Intersection Left- and Right-turn Lanes written by Douglas W. Harwood and published by . This book was released on 2002 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of research that performed a well-designed before-after evaluation of the safety effects of providing left- and right-turn lanes for at-grade intersections. Geometric design, traffic control, traffic volume, and traffic accident data were gathered for a total of 280 improved intersections, as well as 300 similar intersections that were not improved during the study period. The types of improvement projects evaluated included installation of added left-turn lanes, added right-turn lanes, and extension of the length of existing left- or right-turn lanes. An observational before-after evaluation of these projects was performed using several alternative evaluation approaches. The three contrasting approaches to before-after evaluation used were the yoked comparison or matched-pair approach, the comparison group approach, and the Empirical Bayes approach. The research not only evaluated the safety effectiveness of left- and right-turn lane improvements, but also compared the performance of these three alternative approaches in making such evaluations. The research developed quantitative safety effectiveness measures for installation design improvements involving added left-turn lanes and added right-turn lanes. The research concluded that the Empirical Bayes method provided the most accurate and reliable results. Further use of this method is recommended.

Safety effectiveness of intersection left- and right-turn lanes

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Author :
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (948 download)

Book Synopsis Safety effectiveness of intersection left- and right-turn lanes by :

Download or read book Safety effectiveness of intersection left- and right-turn lanes written by and published by . This book was released on 2002 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Safety Effectiveness of Intersection Left- and Right-turn Lanes

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Author :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (13 download)

Book Synopsis Safety Effectiveness of Intersection Left- and Right-turn Lanes by :

Download or read book Safety Effectiveness of Intersection Left- and Right-turn Lanes written by and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Traffic Signal Timing Manual

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Author : U.s. Department of Transportation
Publisher : CreateSpace
ISBN 13 : 9781508557173
Total Pages : 286 pages
Book Rating : 4.5/5 (571 download)

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.

Safety Effectiveness of Intersection Left- and Right-turn Lanes

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Author : Douglas W. Harwood
Publisher :
ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.:/5 (946 download)

Book Synopsis Safety Effectiveness of Intersection Left- and Right-turn Lanes by : Douglas W. Harwood

Download or read book Safety Effectiveness of Intersection Left- and Right-turn Lanes written by Douglas W. Harwood and published by . This book was released on 2002 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Traffic Engineering Handbook

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Author : ITE (Institute of Transportation Engineers)
Publisher : John Wiley & Sons
ISBN 13 : 1118762304
Total Pages : 688 pages
Book Rating : 4.1/5 (187 download)

Book Synopsis Traffic Engineering Handbook by : ITE (Institute of Transportation Engineers)

Download or read book Traffic Engineering Handbook written by ITE (Institute of Transportation Engineers) and published by John Wiley & Sons. This book was released on 2016-01-26 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get a complete look into modern traffic engineering solutions Traffic Engineering Handbook, Seventh Edition is a newly revised text that builds upon the reputation as the go-to source of essential traffic engineering solutions that this book has maintained for the past 70 years. The updated content reflects changes in key industry standards, and shines a spotlight on the needs of all users, the design of context-sensitive roadways, and the development of more sustainable transportation solutions. Additionally, this resource features a new organizational structure that promotes a more functionally-driven, multimodal approach to planning, designing, and implementing transportation solutions. A branch of civil engineering, traffic engineering concerns the safe and efficient movement of people and goods along roadways. Traffic flow, road geometry, sidewalks, crosswalks, cycle facilities, shared lane markings, traffic signs, traffic lights, and more—all of these elements must be considered when designing public and private sector transportation solutions. Explore the fundamental concepts of traffic engineering as they relate to operation, design, and management Access updated content that reflects changes in key industry-leading resources, such as the Highway Capacity Manual (HCM), Manual on Uniform Traffic Control Devices (MUTCD), AASSHTO Policy on Geometric Design, Highway Safety Manual (HSM), and Americans with Disabilities Act Understand the current state of the traffic engineering field Leverage revised information that homes in on the key topics most relevant to traffic engineering in today's world, such as context-sensitive roadways and sustainable transportation solutions Traffic Engineering Handbook, Seventh Edition is an essential text for public and private sector transportation practitioners, transportation decision makers, public officials, and even upper-level undergraduate and graduate students who are studying transportation engineering.

Safety Evaluation of Left-turn Lane Line Width at Intersections with Opposing Left-turn Lanes

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Author : Aemal Jan Khattak
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.3/5 (555 download)

Book Synopsis Safety Evaluation of Left-turn Lane Line Width at Intersections with Opposing Left-turn Lanes by : Aemal Jan Khattak

Download or read book Safety Evaluation of Left-turn Lane Line Width at Intersections with Opposing Left-turn Lanes written by Aemal Jan Khattak and published by . This book was released on 2004 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Safety Effectiveness of Highway Design Features: Intersections

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Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Safety Effectiveness of Highway Design Features: Intersections by :

Download or read book Safety Effectiveness of Highway Design Features: Intersections written by and published by . This book was released on 1992 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of Warrants for Installation of Dual Right-turn Lanes at Signalized Intersections

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Author : Yi Qi
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.3/5 (555 download)

Book Synopsis Development of Warrants for Installation of Dual Right-turn Lanes at Signalized Intersections by : Yi Qi

Download or read book Development of Warrants for Installation of Dual Right-turn Lanes at Signalized Intersections written by Yi Qi and published by . This book was released on 2012 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Right-turn lanes provide space for the deceleration and storage of right-turn vehicles, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reasons: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at the intersection. In addition, a number of other factors may affect the decisions on the installation of dual right-turn lanes. However, warrants for dual right lane installation are almost non-existent, leaving traffic engineers to rely on engineering judgment. This research aims to develop warrants for installation of dual right-turn lanes at signalized intersections. Both the operational and safety benefits/costs were analyzed by surveying traffic engineers and by conducting traffic simulation-based analysis. Microscopic traffic simulation model, VISSIM, was used to quantify the operation benefits and Surrogate Safety Assessment Model (SSAM) developed by Siemens was used to analyze the safety gains due to installation of dual right-turn lanes.

Impacts on Safety of Left-turn Treatment at High Speed Signalized Intersections

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Author : T. H. Maze
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.3/5 (555 download)

Book Synopsis Impacts on Safety of Left-turn Treatment at High Speed Signalized Intersections by : T. H. Maze

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.

Development of Left-turn Lane Guidelines for Signalized and Unsignalized Intersections

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Author :
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.3/5 (555 download)

Book Synopsis Development of Left-turn Lane Guidelines for Signalized and Unsignalized Intersections by :

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.

Roundabouts

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Author : Lee August Rodegerdts
Publisher : Transportation Research Board
ISBN 13 : 0309155118
Total Pages : 407 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Roundabouts by : Lee August Rodegerdts

Download or read book Roundabouts written by Lee August Rodegerdts and published by Transportation Research Board. This book was released on 2010 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

An Evaluation of the Safety Effectiveness of Offsetting Opposing Left-turn Lanes at Intersections

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Author : Bhaven Naik
Publisher :
ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.:/5 (577 download)

Book Synopsis An Evaluation of the Safety Effectiveness of Offsetting Opposing Left-turn Lanes at Intersections by : Bhaven Naik

Download or read book An Evaluation of the Safety Effectiveness of Offsetting Opposing Left-turn Lanes at Intersections written by Bhaven Naik and published by . This book was released on 2004 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Guide for the Planning, Design, and Operation of Pedestrian Facilities

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Author :
Publisher : AASHTO
ISBN 13 : 1560512717
Total Pages : 142 pages
Book Rating : 4.5/5 (65 download)

Book Synopsis Guide for the Planning, Design, and Operation of Pedestrian Facilities by :

Download or read book Guide for the Planning, Design, and Operation of Pedestrian Facilities written by and published by AASHTO. This book was released on 2004 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Pedestrian Facilities Users Guide: Providing Safety and Mobility

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Author : Charles V. Zegeer
Publisher : DIANE Publishing
ISBN 13 : 1428995501
Total Pages : 164 pages
Book Rating : 4.4/5 (289 download)

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.

The Handbook of Road Safety Measures

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Author : Rune Elvik
Publisher : Emerald Group Publishing
ISBN 13 : 1848552505
Total Pages : 1137 pages
Book Rating : 4.8/5 (485 download)

Book Synopsis The Handbook of Road Safety Measures by : Rune Elvik

Download or read book The Handbook of Road Safety Measures written by Rune Elvik and published by Emerald Group Publishing. This book was released on 2009-10-14 with total page 1137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains summaries of the knowledge regarding the effects of 128 road safety measures. This title covers various areas of road safety including: traffic control; vehicle inspection; driver training; publicity campaigns; police enforcement; and, general policy instruments. It also covers topics such as post-accident care, and speed cameras.

Safety Effectiveness of Highway Design Features. Volume V: Intersections

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Author : Stephen R. Kuciemba
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Safety Effectiveness of Highway Design Features. Volume V: Intersections by : Stephen R. Kuciemba

Download or read book Safety Effectiveness of Highway Design Features. Volume V: Intersections written by Stephen R. Kuciemba and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: