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Author : Michael O. Rodgers
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (22 download)
Download or read book Evaluation of Factors Influencing Roundabout Performance written by Michael O. Rodgers and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Baabak Ashuri
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (126 download)
Download or read book Entrusted Engineer-in-charge written by Baabak Ashuri and published by . This book was released on 2021 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lee August Rodegerdts
Publisher : Transportation Research Board
ISBN 13 : 0309155118
Total Pages : 407 pages
Book Rating : 4.3/5 (91 download)
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.
Author : Christopher John Dixon Laurence
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (595 download)
Download or read book Roundabout Capacity Prediction written by Christopher John Dixon Laurence and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raffaele Mauro
Publisher : Springer Science & Business Media
ISBN 13 : 3642045510
Total Pages : 168 pages
Book Rating : 4.6/5 (42 download)
Download or read book Calculation of Roundabouts written by Raffaele Mauro and published by Springer Science & Business Media. This book was released on 2010-03-10 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roundabouts have become one of the most significant traffic control measures because they are generally statistically safer and more efficient than traditional at grade intersections. This book is dedicated to the evaluation of the operating conditions of roundabouts. In five parts, it thoroughly illustrates the calculation of the capacity, including reliability, and waiting phenomena parameters, such as the times spent in the system and queue lengths. Fully worked examples are included throughout the chapters, with detailed explanations.
Author : Lee August Rodegerdts
Publisher :
ISBN 13 : 9780309284141
Total Pages : 260 pages
Book Rating : 4.2/5 (841 download)
Download or read book Evaluating the Performance of Corridors with Roundabouts written by Lee August Rodegerdts and published by . This book was released on 2014 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this research was to provide traffic engineers, transportation planners, and other practitioners with performance measurement and evaluation methods to evaluate comprehensively the performance of functionally interdependent roundabouts on arterials, thus enabling a comparison with signalized intersections, in order to arrive at a design solution."--Project information.
Author : Tomaž Tollazzi
Publisher : Springer
ISBN 13 : 3319090844
Total Pages : 214 pages
Book Rating : 4.3/5 (19 download)
Download or read book Alternative Types of Roundabouts written by Tomaž Tollazzi and published by Springer. This book was released on 2014-11-07 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a history of roundabouts, an introduction to their design, calculations of their capacity and traffic-safety features. It describes the key features of standard roundabouts and their limitations. Alternative types of roundabouts are a fairly recent development and have only been implemented in a few countries to date. The book illustrates a broad variety of these recent alternative types of roundabouts, as well as proposed types still in the development phase, explaining for each the specific needs it meets, its advantages and drawbacks. In closing, the book offers an outlook on the role of roundabouts in future street traffic.
Author : Christopher Day
Publisher :
ISBN 13 : 9781622602773
Total Pages : pages
Book Rating : 4.6/5 (27 download)
Download or read book Best Practices for Roundabouts on State Highways written by Christopher Day and published by . This book was released on 2013-12-05 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a series of research findings from an investigation into roundabout operations. This includes a comparison of several analysis tools for estimating roundabout performance (the Highway Capacity Manual, SIDRA, ARCADY, VISSIM, and SimTraffic); a measurement of rejected headways for the purpose of analyzing critical headway; a review of roundabout lighting practices; and a review of considerations for roundabout site selection. It was found that VISSIM and SIDRA provided the most reliable predictions of roundabout performance for the test site analyzed herein. Additionally, the critical headways measured at this site were significantly lower (at a median value of 2.2 seconds) than other values published in the literature, with driving populations less acquainted with roundabouts. Additionally, a site selection procedure is developed based on a survey of peer agency practices and a checklist is provided for assisting in the determination of whether roundabout control is a feasible alternative for a location. Finally, based upon a review of the literature and practices commonly followed by peer states, we recommend that roundabouts be lighted.
Author : Elisha Jackson Wankogere
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (94 download)
Download or read book Virtual Analysis and Evaluation of Roundabout Safety and Operational Features written by Elisha Jackson Wankogere and published by . This book was released on 2014 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roundabouts can be a solution to safety concerns present at other types of intersections. Recently in the United States, there has been an increase in conversion of problematic intersections to roundabouts to improve their safety. However, it is difficult to make these roundabouts, especially multi-lane roundabouts, safe to all ranges of users. Roundabout features such as advance warning and signage play an important role in determining driver performance as they navigate the roundabout. This research is an effort to evaluate new and existing roundabout safety and operational features such as signs and pavement markings and how they influence performance of drivers at multi-lane roundabouts. It evaluates the two-lane roundabout and the rotor turbo roundabout as an alternative geometric design to a multi-lane roundabout. Virtual scenario simulation by use of a driving simulator is employed to probe driver response to a variety of roundabouts features. The results indicate that lane keeping and speeding are still a problem in multi-lane roundabouts. The rotor turbo roundabout performs better in correctness of lane choice and navigation speed control. Yielding was not a significant problem in both kinds of roundabouts. Furthermore, it was found that roundabout signs and pavement markings used in the United States can be adopted for turbo roundabouts.
Author : Lee Rodegerdts
Publisher : Transportation Research Board
ISBN 13 : 0309098742
Total Pages : 125 pages
Book Rating : 4.3/5 (9 download)
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."
Author : Derek Roach
Publisher :
ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (95 download)
Download or read book Towards Sustainable Roundabouts written by Derek Roach and published by . This book was released on 2015 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roundabouts have been gaining acceptance by city planners and traffic engineers alike. The number of roundabouts in the U.S. has risen to roughly 3,700 over the last 20 years. Due to this rise in use, there has been a need to better understand the characteristics roundabouts have and how they affect the performance of transportation networks. Sustainability-related advantages of roundabouts are of particular interest. Field data were collected for the purpose of determining the critical gap at a double single-lane roundabout and whether that value is substantially different than other types of intersections like stop-controlled intersections. Critical gap values are used in micro-simulation software and the more accurate the input data are the more accurate the model behaves compared to reality. VISSIM, a micro-simulation software was used to develop models for two roundabouts, a single-lane roundabout and a double single-lane roundabout. The single-lane roundabouts was previously a signalized intersection and the double single-lane roundabout used to be two stop-controlled intersections. Models of both the current conditions and the previous conditions of these two locations were developed for both the morning and evening peak periods of demand. Due to lack of data for the previous condition entry volumes, the current volumes were used for the previous condition models. These eight models were used for a before and after comparison of emission levels to determine what types of intersections are most sustainable in terms of emissions. In addition, the after models were used for a safety evaluation of the two roundabouts. The after condition models of the two locations were used to produce vehicle trajectory files that can be interpreted by the Surrogate Safety Assessment Model (SSAM), a conflict estimation software developed by the Federal Highway Administration. This was done to determine if SSAM is an adequate tool for estimating the total number, type, and location of conflicts that occur at both a single-lane roundabout and a double single-lane roundabout. To validate findings the SSAM data were compared to a safety analysis conducted on video data collected at each site. Another field study was conducted that utilized the Intelligence to Drive (i2D) device that plugs into a vehicle's on-board diagnostic port. This device can produce a vehicle's speed profile and estimate the level of emissions produced while the car is running. The combination of this device with video data were used to attempt determining the relationship between pedestrian activity and the level of emissions at roundabouts. This research showed that the critical gap at a roundabout is significantly different than the default values used in micro-simulation. The stop sign controlled intersections, which were the before condition of the double roundabout produced higher emissions than the double roundabout. The signalized intersection, which was the before condition for the single-lane roundabout, produced considerably fewer emissions than the single-lane roundabout. SSAM was shown to be a reliable tool for estimating the total number, type, and location of conflicts that occur at both locations. The relationship between pedestrians and high emission levels at roundabouts was difficult to determine due to the small number of data that were collected. However, based on the speed profiles it was shown that the presence of pedestrians at roundabouts could potentially lead to more aggressive deceleration rates causing them to produce higher levels of emissions. Future research should include: 1) continuing all the studies presented above for a variety of roundabouts with various geometric and traffic conditions to determine if the observed patterns hold true, and 2) collecting more data with the i2D device to determine a clear relationship between the presence of pedestrians at roundabouts and the associated emission levels.
Author : Alek Pochowski
Publisher :
ISBN 13 : 9780309272087
Total Pages : 81 pages
Book Rating : 4.2/5 (72 download)
Download or read book Roundabout Practices written by Alek Pochowski and published by . This book was released on 2016 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: As of 2013, there were an estimated 3,200 roundabouts in use throughout the country. This synthesis documents and summarizes roundabout policies, guidance, and practices in place within state departments of transportation (DOTs) as of 2015. The primary focus of the synthesis is on roundabout selection and design with a secondary focus on performance analysis. Information used in this study was gathered through a literature review and a survey of state DOTs. Personnel from seven states were interviewed to create case examples and more specific information. Among the findings, the primary reason cited for the selection of roundabouts is improved safety performance compared with other intersection options, followed by shorter vehicular delays and higher capacity. Planning-level cost estimates (screening or feasibility level estimates) for mini-, single-lane, and multilane roundabouts ranged from $249,000 to $2.05 million. The majority of reporting states have developed some public education materials to support roundabout projects, such as websites, videos, and flyers and/or pamphlets. To analyze roundabout performance, about three-quarters of the reporting states use some form of the Highway Capacity Manual 2010 model and SIDRA’s Standard Model. Most of the reporting states analyze safety performance at roundabouts, using crash modification factors, crash reduction factors, and/or the Highway Safety Manual predictive methodology. Most states use a design life of 20 years when developing the ultimate roundabout design. However, the majority uses a phased implementation approach.
Author : Rahmi Akc̜elik
Publisher :
ISBN 13 : 9780869107621
Total Pages : 151 pages
Book Rating : 4.1/5 (76 download)
Download or read book Roundabouts written by Rahmi Akc̜elik and published by . This book was released on 1998 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vergil G. Stover
Publisher :
ISBN 13 :
Total Pages : 696 pages
Book Rating : 4.3/5 (555 download)
Download or read book Transportation and Land Development written by Vergil G. Stover and published by . This book was released on 2002 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lee August Rodegerdts
Publisher :
ISBN 13 : 9780309284141
Total Pages : pages
Book Rating : 4.2/5 (841 download)
Download or read book Evaluating the Performance of Corridors with Roundabouts written by Lee August Rodegerdts and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this research was to provide traffic engineers, transportation planners, and other practitioners with performance measurement and evaluation methods to evaluate comprehensively the performance of functionally interdependent roundabouts on arterials, thus enabling a comparison with signalized intersections, in order to arrive at a design solution."--Project information.
Author : Waheed Uddin
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (787 download)
Download or read book Performance Evaluation of Roundabouts for Traffic Delay and Crash Reductions in Oxford, MS written by Waheed Uddin and published by . This book was released on 2011 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to increased traffic volume, congestion, and capacity limitations, two roundabouts have been constructed on South Lamar Boulevard ramp intersections with MS Highway 6 in Oxford, MS. Roundabouts replaced the existing signalized intersection on the north and stop controlled intersections on the south side of the South Lamar Boulevard and MS Highway 6 Interchange. The overall objective of this study was to assess the performance of the roundabouts in Oxford with respect to traffic flow, capacity, and safety improvements, and to determine the public perception of roundabouts by means of an opinion survey. Detailed post-roundabout traffic movement volume and crash data were collected and compared with the pre-roundabout data to assess the in-service performance of the roundabouts. Traffic flow microsimulation and capacity analysis methods were used to evaluate performance of the roundabouts. The results of the Oxford roundabout study showed significant improvement in traffic flow, crash reduction, and reduction in vehicle emissions. It was found that the conversion of the intersections to roundabouts improved traffic flow by reducing average delay by 24%, idling time by 77%, and fuel wastage by 56%. Overall vehicle emissions from idling were reduced significantly including 56% in CO2, 80% in VOC, and 77% in CO, NOx, and PM10.
Author : Hillary Isebrands
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (298 download)
Download or read book Toolbox to Evaluate the Impacts of Roundabouts on a Corridor Or Roadway Network written by Hillary Isebrands and published by . This book was released on 2008 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A "Toolbox to Evaluate the System Impacts of Roundabouts on a Corridor or Roadway Network" was developed to assist transportation agencies with assessing the impacts of roundabouts on a corridor or system in terms of transportation planning, corridor and network mobility, land use, flow conditions, access management, and other planning considerations (i.e. pedestrians, emissions). The Toolbox will allow agencies to consider the "big picture" rather than assessing the safety and/or operational impacts of isolated roundabouts. Many portions of the toolbox can be applied to isolated roundabouts as well. The toolbox covers the following general topics: Roundabouts in comprehensive planning; Impact of roundabouts on corridor mobility; Impact of roundabouts on system-wide mobility; Roundabout performance with unbalanced traffic flows; Roundabouts in access management; Impact of roundabouts on other planning considerations. The toolbox contains a summary of available information about each topic, case studies, an analysis of operations for a roundabout in two signalized corridors, and lessons learned.
