Author: Brian PorterPublisher:
ISBN:
Category :
Languages : en
Pages : 140
Book Description
An Evaluation of Multilane Roundabout Capacity and Delay Models Using Field Data from Wisconsin
Author: Brian PorterA Formulation to Evaluate Capacity and Delay of Multilane Roundabouts in the United States for Implementation Into a Travel Forecasting Model
Author: Erik Lawrence SeiberlichPublisher:
ISBN:
Category : Highway capacity
Languages : en
Pages : 180
Book Description
A formulation to evaluate capacity and delay of multilane roundabouts in the United States for implementation into a travel forecasting model
Author: Capacity Models for Multilane Roundabouts and Their Evaluation Using Microscopic Simulation Models
Author: Mohamad A. ShraytehPublisher:
ISBN:
Category : Highway capacity
Languages : en
Pages : 340
Book Description
Compared to previous versions of the manual, the Highway Capacity Manual 2010 has provided more comprehensive capacity models for single and multilane roundabouts. The Highway Capacity Manual 2010 multilane roundabout capacity models are limited to two-by-two lanes, that is, two entry lanes and two circulating lanes. These capacity models are not valid for the three-by-three-lane roundabouts (three entry lanes and three circulating lanes) due to different traffic flow characteristics and features. This limitation of the Highway Capacity Manual 2010 model is also clearly mentioned in the manual. In this research, capacity models and curves were developed for three-by-three-lane roundabouts. More than 168 hours of video recordings were done on 12 three-by-three-lane roundabouts. The extracted data from the video recordings was used to understand the traffic operations and to develop the capacity models. It was found that lane utilization of the outermost circulating lane was low, and drivers preferred to use the middle entry lane for through movements as compared to the other two lanes. Based on the performance and usefulness, exponential regression models were selected for capacity estimation. The capacity curves were developed for the entry approach and for each entry lane of the three-by-three-lane roundabout. These models were used to estimate the follow-up headway and critical gap. The output of the proposed models showed that the entry volume decreases with the increase of the circulating flow at the three-by-three-lane roundabouts. The proposed models were also validated using a microscopic traffic-simulation model. A close association was found between outputs from both models. Transportation engineers can use the vii capacity models and curves presented in this research to perform the three-by-three-lane roundabout capacity analysis. Keywords: Three-by-three-lane roundabout, multilane roundabout, VisSim, capacity models, capacity curves, conflict areas.
Roundabouts
Author: Lee August RodegerdtsPublisher: Transportation Research Board
ISBN: 0309155118
Category : Technology & Engineering
Languages : en
Pages : 407
Book Description
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.
Wisconsin Highway Traffic Volume Data
Author: Global Sensitivity Analysis
Author: Andrea SaltelliPublisher: John Wiley & Sons
ISBN: 9780470725177
Category : Mathematics
Languages : en
Pages : 304
Book Description
Complex mathematical and computational models are used in all areas of society and technology and yet model based science is increasingly contested or refuted, especially when models are applied to controversial themes in domains such as health, the environment or the economy. More stringent standards of proofs are demanded from model-based numbers, especially when these numbers represent potential financial losses, threats to human health or the state of the environment. Quantitative sensitivity analysis is generally agreed to be one such standard. Mathematical models are good at mapping assumptions into inferences. A modeller makes assumptions about laws pertaining to the system, about its status and a plethora of other, often arcane, system variables and internal model settings. To what extent can we rely on the model-based inference when most of these assumptions are fraught with uncertainties? Global Sensitivity Analysis offers an accessible treatment of such problems via quantitative sensitivity analysis, beginning with the first principles and guiding the reader through the full range of recommended practices with a rich set of solved exercises. The text explains the motivation for sensitivity analysis, reviews the required statistical concepts, and provides a guide to potential applications. The book: Provides a self-contained treatment of the subject, allowing readers to learn and practice global sensitivity analysis without further materials. Presents ways to frame the analysis, interpret its results, and avoid potential pitfalls. Features numerous exercises and solved problems to help illustrate the applications. Is authored by leading sensitivity analysis practitioners, combining a range of disciplinary backgrounds. Postgraduate students and practitioners in a wide range of subjects, including statistics, mathematics, engineering, physics, chemistry, environmental sciences, biology, toxicology, actuarial sciences, and econometrics will find much of use here. This book will prove equally valuable to engineers working on risk analysis and to financial analysts concerned with pricing and hedging.
Roundabouts in the United States
Author: Lee RodegerdtsPublisher: Transportation Research Board
ISBN: 0309098742
Category : Roads
Languages : en
Pages : 125
Book Description
"Research sponsored by the American Association of State Highway and Transporation Officials in cooperation with the Federal Highway Administration."
Transportation Decision Making
Author: Kumares C. SinhaPublisher: John Wiley & Sons
ISBN: 1118169662
Category : Technology & Engineering
Languages : en
Pages : 576
Book Description
This pioneering text provides a holistic approach to decisionmaking in transportation project development and programming, whichcan help transportation professionals to optimize their investmentchoices. The authors present a proven set of methodologies forevaluating transportation projects that ensures that all costs andimpacts are taken into consideration. The text's logical organization gets readers started with asolid foundation in basic principles and then progressively buildson that foundation. Topics covered include: Developing performance measures for evaluation, estimatingtravel demand, and costing transportation projects Performing an economic efficiency evaluation that accounts forsuch factors as travel time, safety, and vehicle operatingcosts Evaluating a project's impact on economic development and landuse as well as its impact on society and culture Assessing a project's environmental impact, including airquality, noise, ecology, water resources, and aesthetics Evaluating alternative projects on the basis of multipleperformance criteria Programming transportation investments so that resources can beoptimally allocated to meet facility-specific and system-widegoals Each chapter begins with basic definitions and concepts followedby a methodology for impact assessment. Relevant legislation isdiscussed and available software for performing evaluations ispresented. At the end of each chapter, readers are providedresources for detailed investigation of particular topics. Theseinclude Internet sites and publications of international anddomestic agencies and research institutions. The authors alsoprovide a companion Web site that offers updates, data foranalysis, and case histories of project evaluation and decisionmaking. Given that billions of dollars are spent each year ontransportation systems in the United States alone, and that thereis a need for thorough and rational evaluation and decision makingfor cost-effective system preservation and improvement, this textshould be on the desks of all transportation planners, engineers,and educators. With exercises in every chapter, this text is anideal coursebook for the subject of transportation systems analysisand evaluation.
Pedestrian Facilities Users Guide: Providing Safety and Mobility
Author: Charles V. ZegeerPublisher: DIANE Publishing
ISBN: 1428995501
Category : Pedestrian accidents
Languages : en
Pages : 164
Book Description
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.