Development Of Warrants For Installation Of Dual Right Turn Lanes At Signalized Intersections

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

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

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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.

Development of Warrants for Left-turn Phasing

Author : Kenneth R. Agent
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Development of Warrants for Left-turn Phasing by : Kenneth R. Agent

Download or read book Development of Warrants for Left-turn Phasing written by Kenneth R. Agent and published by . This book was released on 1976 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of Warrants for Left-turn Lanes

Author : Kenneth R. Agent
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Development of Warrants for Left-turn Lanes by : Kenneth R. Agent

Download or read book Development of Warrants for Left-turn Lanes written by Kenneth R. Agent and published by . This book was released on 1979 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Decision Support System and New Warrants for Left Turn Lane Installation at Unsignalised Intersections

Author : Sarang S. Ranade
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis A Decision Support System and New Warrants for Left Turn Lane Installation at Unsignalised Intersections by : Sarang S. Ranade

Download or read book A Decision Support System and New Warrants for Left Turn Lane Installation at Unsignalised Intersections written by Sarang S. Ranade and published by . This book was released on 2007 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accommodating left turns at un-signalized intersections is one of the most challenging problems in traffic engineering. Over the last forty years, a small number of studies developed guidelines for traffic engineers to help decide when a left turn lane is warranted for a given situation. Building on these previous attempts, the current study not only develops warrants for the left turn lane at an unsignalised intersection but also a refined decision support system (DSS) for assessing the likely benefits of left-turn lane installations. The developed warrants use total delay (veh.sec/hour) and total stops (number) on the subject link as the warrant criteria, and the trigger level differs by road category. The developed DSS on the other hand, is designed to predict the likely benefits of installation of an exclusive left turn lane at an un-signalized intersection. The benefits are measured in terms of delay savings, reductions in the total number of stops, increases in fuel efficiency, and reductions in emissions. The first step in developing the left turn lane warrants and the DSS was to use microscopic simulation to model several real-world un-signalized intersections with different geometric. After carefully calibrating these models, several scenarios which cover a wide range of operational conditions (opposing, advancing, left turning volumes speed etc,) were simulated. The output fiom these simulation runs was then used to train a set of Multi-layer Perceptron Neural Networks (NNs), and to generalize the results from the models' runs. These NNs can therefore serve as a DSS for predicting the likely benefits of left turn lane installations. In addition, new warrants were developed for left turn lane installations based on delay as well as percent stops as warrant criteria.

Development of Left-turn Lane Warrants for Unsignalized Intersections

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (844 download)

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Book Synopsis Development of Left-turn Lane Warrants for Unsignalized Intersections by :

Download or read book Development of Left-turn Lane Warrants for Unsignalized Intersections written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Left-turn movements at intersections, including driveways - especially movements that are made from lanes that are shared with through traffic - cause delays and adversely impact safety. Although left-turn warrants have been updated, many agencies still use research performed by M. Harmelink from the mid-1960s. While most states use procedures that are based on Harmelink, a number of limitations of Harmelink's procedure have been identified. Economic analysis can provide a useful method for combining traffic operations and safety benefits of left-turn lanes to identify situations in which left-turn lanes are and are not justified economically. This project used a benefit-cost approach to determine when a left-turn lane would be justified. The steps included simulation to determine delay savings from installing a left-turn lane, crash costs and crash reduction savings determined from safety performance functions and accident modification factors available in the "Highway Safety Manual," and construction costs. Left-turn lane warrants were developed for rural two-lane highways, rural four-lane highways, and urban and suburban roadways. In addition, warrants for bypass lanes were developed for rural two-lane highways. A "Design Guide on Left-Turn Accommodations at Unsignalized Intersections" was developed that discusses left-turn lane designs, traffic control treatments, and case study examples.

Warrants for Left-turn Signal Phasing

Author : Kenneth R. Agent
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Warrants for Left-turn Signal Phasing by : Kenneth R. Agent

Download or read book Warrants for Left-turn Signal Phasing written by Kenneth R. Agent and published by . This book was released on 1978 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of Pedestrian Safety Based Warrants for Permissive Left-turn Control

Author : Qi Yi (Ph.D.)
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Development of Pedestrian Safety Based Warrants for Permissive Left-turn Control by : Qi Yi (Ph.D.)

Download or read book Development of Pedestrian Safety Based Warrants for Permissive Left-turn Control written by Qi Yi (Ph.D.) and published by . This book was released on 2010 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Warrants for Right-turn Lanes/treatments on Two-lane Roads

Author : Amiy Varma
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.:/5 (426 download)

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Book Synopsis Warrants for Right-turn Lanes/treatments on Two-lane Roads by : Amiy Varma

Download or read book Warrants for Right-turn Lanes/treatments on Two-lane Roads written by Amiy Varma and published by . This book was released on 2008 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project was to analyze geometric, speed, volume, and crash data for a broad range of conditions with the ultimate objective of establishing bases for warrants for right-turn lanes on two-lane roads where major approach did not have any controls. Right-turn lane guidelines for this contest is not clear and convincing. Safety effectiveness and savings were estimated using extensive data examination and analysis of crash data, several statistical models that were developed using crash data, and a conflict model, which was developed using field data. It was found that not all accidents are eliminated with use of right-turn lane. However, right-turn lanes were effective in improving safety. More interesting was the finding that safety effectiveness of right-turn lanes was more at driveways than at intersections. Operational effectiveness was estimated using a delay model and a fuel consumption model, which were developed using field data, simulation software (CORSIM®), and statistical software, Minitab®. The volume thresholds that varied with changes in right-turn lane cost and fuel cost were provided as alternative scenarios for warrants. The warrants established here will be helpful in decision-making regarding whether to implement a right-turn lane or not on two-lane roads.

Development of Warrants for Left-turn Lanes at Unsignalized Intersections in Korea

Author : Kyung-Whan Kim
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (18 download)

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Book Synopsis Development of Warrants for Left-turn Lanes at Unsignalized Intersections in Korea by : Kyung-Whan Kim

Download or read book Development of Warrants for Left-turn Lanes at Unsignalized Intersections in Korea written by Kyung-Whan Kim and published by . This book was released on 1986 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Roundabouts

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

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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.

Guidelines for Free Right-turn Lanes at Unsignalized Intersections on Rural Two-lane Highways

Author :
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Guidelines for Free Right-turn Lanes at Unsignalized Intersections on Rural Two-lane Highways by :

Download or read book Guidelines for Free Right-turn Lanes at Unsignalized Intersections on Rural Two-lane Highways written by and published by . This book was released on 1995 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Free right-turn (FRT) lanes are turning roadways at intersections that provide for free-flowing right-turn movements. The objective of the research presented in this report was to develop guidelines for FRT lanes at unsignalized intersections on rural two-lane highways in Nebraska. The development of the guidelines was based on a benefit-cost analysis, which determined the right-turn volumes required to justify the construction and maintenance of FRT lanes at these locations. The research involved the evaluation of the operational and safety effects of FRT lanes. The operational effects of FRT lanes were analyzed using kinematic and traffic flow models. Accident data analysis, field studies, and computer simulation of truck dynamics were used to evaluate the safety effects of FRT lanes. The results of these analyses were also used to determine acceptable design criteria for FRT lanes. A survey of other state agencies was conducted to identify any existing guidelines, design criteria, and experience that might be useful in developing the guidelines and evaluating the design criteria. Also, the concerns of citizens opposed to the removal of FRT lanes were examined in an effort to develop guidelines that might effectively address these concerns. The results of the research indicate that design-year right-turn AADTs ranging from 440 to 825 vehicles per day, depending on the percentage of trucks, are required to warrant a FRT lane at an unsignalized intersection of rural two-lane highways. A design speed of 40 mph was found to be a realistic design speed and the most cost-effective design speed for FRT lanes. However, design speeds up to 55 mph do not significantly reduce the cost effectiveness of a FRT lane. The AASHTO design criteria for curves on open highways were found to be appropriate for designing the curvature of FRT lanes. The AASHTO criteria for minimum-radii intersection curves were not acceptable. Also, acceleration lanes were found to improve the safety of the merging operations associated with FRT lanes. The results of the accident data analysis do not support the perceptions of concerned citizens regarding the safety benefits of FRT lanes. FRT lanes were not found to affect the frequency, severity, or types of accidents that occur at unsignalized intersections on rural two-lane highways. Thus, FRT lanes should not be perceived, or promoted, as traffic safety improvements. The benefits of FRT lanes are limited to improving the efficiency of right-turn movements.

Lackawanna County Proposed New Business Park, Development and Operation, Lackawanna County

Author :
Publisher :
ISBN 13 :
Total Pages : 868 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Lackawanna County Proposed New Business Park, Development and Operation, Lackawanna County by :

Download or read book Lackawanna County Proposed New Business Park, Development and Operation, Lackawanna County written by and published by . This book was released on 1999 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Volume Warrants for Left-turn Lanes at Unsignalized Grade Intersections

Author : M. D. Harmelink
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Volume Warrants for Left-turn Lanes at Unsignalized Grade Intersections by : M. D. Harmelink

Download or read book Volume Warrants for Left-turn Lanes at Unsignalized Grade Intersections written by M. D. Harmelink and published by . This book was released on 1967 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Roundabouts in the United States

Author : Lee Rodegerdts
Publisher : Transportation Research Board
ISBN 13 : 0309098742
Total Pages : 125 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Roundabouts in the United States by : Lee Rodegerdts

Download or read book Roundabouts in the United States written by Lee Rodegerdts and published by Transportation Research Board. This book was released on 2007 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Research sponsored by the American Association of State Highway and Transporation Officials in cooperation with the Federal Highway Administration."

Estimating Capacity of Dual Right-turn Lanes at Signalized Intersections

Author : Da Li
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (98 download)

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Book Synopsis Estimating Capacity of Dual Right-turn Lanes at Signalized Intersections by : Da Li

Download or read book Estimating Capacity of Dual Right-turn Lanes at Signalized Intersections written by Da Li and published by . This book was released on 2013 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Assessment of Multiple Left-turn Phasing Strategies

Author :
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Assessment of Multiple Left-turn Phasing Strategies by :

Download or read book Assessment of Multiple Left-turn Phasing Strategies written by and published by . This book was released on 2004 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Missouri, multiple left-turns are gaining popularity. However, the installation of these multiple left-turn raises questions for which the Missouri Department of Transportation (MoDOT) has not yet developed answers. Specifically, MoDOT seeks guidance on: Criteria for determining when to install double and triple left-turns. The type of phasing to be used for dual and triple left-turn lanes. Whether to use "Dallas" or permitted lead-lag phasing for any left-turn lanes. Where to begin reducing the number receiving lanes downstream of an intersection with multiple left-turn lanes

Traffic Engineering Handbook

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

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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.