Download or read book Updating Speed flow and Speed capacity Relationships in Traffic Assignment written by Rupinder Singh and published by . This book was released on 1993 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating Freeway Speed flow Relationships for Traffic Assignment Applications written by Meead Saberi Kalaee and published by . This book was released on 2010 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in high resolution traffic sensors over the past decades are providing a wealth of empirical speed-flow data. Travel demand models use speed-flow relationships to assign traffic flows to network links. However, speed-flow relationships have not been revalidated against new detailed traffic sensor data. Therefore, it is necessary to revisit speed-flow relationships based on actual measured conditions on network links rather than assuming constant speed-flow relationships over entire highway network systems. Speed-flow relationships have been particularly difficult to calibrate and estimate when traffic volumes approach capacity, i.e. when the v/c ratio approaches one. This thesis empirically evaluates the speed-flow relationships for v/c 1 using field data. For congested conditions (v/c 1) a theoretical approach is taken. A new methodology to determine the distribution of the activation of bottlenecks, bottleneck duration, and bottleneck deactivation is proposed. This thesis is a new contribution to understand the stochastic nature of freeway capacity as well as bottleneck duration, activation, and deactivation. Unlike previous research efforts, this thesis studies speed-flow relationships at the lane level and later presents a method to estimate speed-flow relationships at the link level.

Download or read book Planning Techniques to Estimate Speeds and Service Volumes for Planning Applications written by Richard Gerhard Dowling and published by Transportation Research Board. This book was released on 1997 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Short Term Travel Model Improvements written by Cambridge Systematics and published by . This book was released on 1994 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Artificial Intelligence In Highway Location And Alignment Optimization Applications Of Genetic Algorithms In Searching Evaluating And Optimizing Highway Location And Alignments written by Min-wook Kang and published by World Scientific. This book was released on 2020-08-14 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph provides a comprehensive overview of methods for searching, evaluating, and optimizing highway location and alignments using genetic algorithms (GAs), a powerful Artificial Intelligence (AI) technique. It presents a two-level programming structure to deal with the effects of varying highway location on traffic level changes in surrounding road networks within the highway location search and alignment optimization process. In addition, the proposed method evaluates environmental impacts as well as all relevant highway costs associated with its construction, operation, and maintenance. The monograph first covers various search methods, relevant cost functions, constraints, computational efficiency, and solution quality issues arising from optimizing the highway alignment optimization (HAO) problem. It then focuses on applications of a special-purpose GA in the HAO problem where numerous highway alignments are generated and evaluated, and finally the best ones are selected based on costs, traffic impacts, safety, energy, and environmental considerations. A review of other promising optimization methods for the HAO problem is also provided in this monograph.

Download or read book Fundamentals of Traffic Engineering written by Wolfgang S. Homburger and published by . This book was released on 2001 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traffic Engineering Control written by and published by . This book was released on 1994 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Speed flow Relationships for Basic Freeway Segments written by James Schoen and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the study and refinement of capacity and level of service analysis procedures for basic freeway sections. Speed-flow data collected at 47 sites located throughout the United States was used to study three specific flow regimes: free flow, queue discharge, and congested flow. The effects of various geometric, operational, and environmental factors on capacity and free-flow speed were also studied. Statistical analyses were conducted to determine relationships between speed and flow in each regime and the relationship between freeway design features and capacity and free-flow speed. The research findings confirm that the basic shape of the speed-flow curve for the free flow regime is essentially flat at low to moderate flows and gradually decreases to a maximum capacity of 2400 pcphpl. In addition, effects of lane width, lateral clearance, number of lanes, and the frequency of interchanges, were identified and were used to develop appropriate adjustment factors. The study of the queue discharge indicated that flows in this regime are generally lower than maximum flows under free flow conditions. However, queue discharge flows can be highly variable depending upon the type of bottleneck which causes the queue formation and the influence of downstream traffic conditions. The research also suggests that under congested flow speeds higher than those previously assumed can be attained. This report includes a recommended procedure for the level of service analysis of basic freeway sections, including a revised set of speed-flow curves for the free flow regime. The results of this study are intended to be incorporated into a revised Chapter 3 of the Highway Capacity Manual.

Download or read book Additional Enhancements to FUTMS written by Reid H. Ewing and published by . This book was released on 1997 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transportation Research Record written by and published by . This book was released on 2002 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: "For more than 50 years, the Transportation Research Record has been internationally recognized as one of the preeminent peer-reviewed journals for transportation research papers from authors in the United States and from around the world. One of the most cited transportation journals, the TRR offers unparalleled depth and breadth in the coverage of transportation topics from both academic and practitioner perspectives. All modes of passenger and freight transportation are addressed in papers covering a wide array of disciplines, including policy, planning, administration, economics and financing, operations, construction, design, maintenance, safety, and more."--Publisher's website

Download or read book Traffic Capacity Estimation Considering Speed Flow Relationship on NH8 written by Vikram Patel and published by . This book was released on 2016-10-09 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by and published by . This book was released on 1997 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book San Francisco Bay Area 1990 Travel Model Development Project written by and published by . This book was released on 1995 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved Speed flow Relationships written by Rupinder Singh and published by . This book was released on 1999 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traffic Simulation and Data written by Winnie Daamen and published by CRC Press. This book was released on 2014-09-17 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: A single source of information for researchers and professionals, Traffic Simulation and Data: Validation Methods and Applications offers a complete overview of traffic data collection, state estimation, calibration and validation for traffic modelling and simulation. It derives from the Multitude Project-a European Cost Action project that incorpo

Download or read book A Flow travel Time Relationship for Traffic Assignment written by Carlos F. Daganzo and published by . This book was released on 1978 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Highway Capacity Manual A Conceptual and Research History written by Roger . P Roess and published by Springer Science & Business Media. This book was released on 2014-04-03 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1950, the Highway Capacity Manual has been a standard used in the planning, design, analysis, and operation of virtually any highway traffic facility in the United States. It has also been widely used abroad, and has spurred the development of similar manuals in other countries. The twin concepts of capacity and level of service have been developed in the manual, and methodologies have been presented that allow highway traffic facilities to be designed on a common basis, and allow for the analysis of operational quality under various traffic demand scenarios. The manual also addresses related pedestrian, bicycle, and transit issues. This book details the fundamental development of the concepts of capacity and level of service, and of the specific methodologies developed to describe them over a wide range of facility types. The book is comprised of two volumes. Volume 1 (this book) focuses on the development of basic principles, and their application to uninterrupted flow facilities: freeways, multilane highways, and two-lane highways. Weaving, merging, and diverging segments on freeways and multilane highways are also discussed in detail. Volume 2 focuses on interrupted flow facilities: signalized and unsignalized intersections, urban streets and arterials. It is intended to help users of the manual understand how concepts, approaches, and specific methodologies were developed, and to understand the underlying principles that each embodies. It is also intended to act as a basic reference for current and future researchers who will continue to develop new and improved capacity analysis methodologies for many years to come.