Download or read book Development of an Integrated Microscopic Traffic Simulation and Signal Timing Optimization Tool written by and published by . This book was released on 2007 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Evaluation of Traffic Simulation Models for Supporting ITS Development written by Sharon Adams Boxill and published by . This book was released on 2000 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tools to evaluate networks under information supply are a vital necessity in light of the systems being implemented as part of the Intelligent Transportation Systems (ITS) deployment plan. One such tool is the traffic simulation model. This report presents an evaluation of the existing traffic simulation models to identify the models that can be potentially applied in ITS equipped networks. The traffic simulation models are categorized according to type (macroscopic, microscopic or mesoscopic), as well as functionality (highway, signal, integrated). The entire evaluation is conducted through two steps: initial screening and in-depth evaluation. The initial step generates a shorter but more specific list of traffic simulation models based on some pre-determined criteria. The in-depth evaluation identifies which model on the shorter list is suitable for a specific area of ITS applications. It is concluded from this research that presently CORSIM and INTEGRATION appear to have the highest probability of success in real-world applications. It is also found that by adding more calibration and validation in the U.S., the AIMSUN 2 and PARAMICS models will be brought to the forefront in the near term for use with ITS applications.

Download or read book Towards Developing an Integrated Microscopic Traffic Simulation Model for Large Road Networks written by Frank Lehmann and published by . This book was released on 2018 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic jams have become one of the key topics in the 21st century and cause immense losses in productivity, increase CO2 emissions and affect driver stress, travel time predictability and increased wear and tear on vehicles. To test possible countermeasures, optimise existing infrastructure or develop new Intelligent Transport Systems (ITS), traffic has to be modelled. The inherent complexity which is a result of inter- and intra-driver heterogeneity, macroscopic feedback loops, local interactions, multi-modal transport and many more is tackled with simulations. By representing the (longitudinal) dynamics of individual vehicles (“microsimulation”), high model fidelity can be achieved. By aggregating the resulting trajectories, macroscopic phenomena emerge and can be incorporated to answer a wide range of traffic-related questions. Since human drivers vary in their perception of stimuli, preferences and reaction, randomness is inevitably and circumvents the construction of perfectly accurate models. Which microscopic features are needed and how they should be mathematically represented runs like a central thread through this thesis. First, it develops a systematic classification scheme to identify modelling strategies and evaluate advantages and shortcomings of (partly) discrete microsimulations. Because real-world trajectories are continuous in time and space, representing them discretely leads to artefacts which induces an upper precision boundary for all models operating on this level of discretisation. Such model-independent errors will be measured based on empirical, naturalistic and synthetically generated trajectories. It is also evaluated to which extent driver heterogeneity and randomness may be compensated with discrete components to simplify modelling and increase computational efficiency. Based on the gained insights, a new, integrated microscopic model is developed. The second major theme in this thesis are gridded, discrete road topologies (chequerboards, Manhattan layouts) populated with vehicles “hopping” from one location to the next. An extensive literature review summarise existing approaches and it is discussed how these standardised road networks and extremely simplified dynamics are well-suited as testbed for ITS. Based on identified research gaps a Timed Automata-based particle hopping model is developed. The two main tools to achieve the outlined objectives are literature reviews, data analysis and computer simulations. To construct the classification scheme, existing genealogies and typologies for traffic models and dynamical systems in other scientific disciplines were reviewed. Another approach was taken for conducting the literature review of chequerboard models: starting from the prototypical BML model, the citing sources are surveyed in reverse order, the behaviour of relevant models is synthesized and contradictions and gaps critically analysed. To quantify the model-independent error, datasets are sampled, quantised and discretised over a wide range of step sizes. Making use of naturalistic driving data, synthetically generated trajectories and high-quality experimental observations, the highest achievable errors for (partly) discrete microsimulations is measured. The dataset recorded under experimental conditions with a group of homogeneous drivers is reused to identify to quantify driver heterogeneity and find the maximum achievable correlations between car-following stimuli and reactions. In summary, this thesis shows that randomness and heterogeneity in human drivers is significant and exceeds the model-independent discretisation errors for a wide range of quantisation parameters. This justifies representing trajectory features discretely to increase computational efficiency and improve the modelling process. Based on this proposition two new formulations for simplistic and advanced microsimulations are developed. The former is able to reproduce all macroscopic free-flow to congestion phase transitions while the latter integrates lateral and longitudinal dynamics based on statistical microscopic properties. Both approaches fill gaps identified by a systematic literature review.

Download or read book Encyclopedia of Transportation written by Mark Garrett and published by SAGE Publications. This book was released on 2014-08-13 with total page 3181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viewing transportation through the lens of current social, economic, and policy aspects, this four-volume reference work explores the topic of transportation across multiple disciplines within the social sciences and related areas, including geography, public policy, business, and economics. Features: Approximately 675 signed articles authored by prominent scholars are arranged in A-to-Z fashion and conclude with Further Readings and cross references. A Chronology helps readers put individual events into historical context; a Reader’s Guide organizes entries by broad topical or thematic areas; a detailed index helps users quickly locate entries of most immediate interest; and a Resource Guide provides a list of journals, books, and associations and their websites. While articles were written to avoid jargon as much as possible, a Glossary provides quick definitions of technical terms. To ensure full, well-rounded coverage of the field, the General Editor with expertise in urban planning, public policy, and the environment worked alongside a Consulting Editor with a background in Civil Engineering. The index, Reader’s Guide, and cross references combine for thorough search-and-browse capabilities in the electronic edition. Available in both print and electronic formats, Encyclopedia of Transportation is an ideal reference for libraries and those who want to explore the issues that surround transportation in the United States and around the world. Key Themes: Administration, Operations, and Evaluation Air Transportation Systems Economics of Transportation Energy, Environmental, and Health Impacts Facilities and Infrastructure Intermodal Transportation Systems International Transportation and Policy Labor Issues/Employee Relations Planning and Policy Safety and Security Social Issues in Transportation Surface Transportation Systems Technology, Design, and Engineering Transportation, Finance of Transportation Legislation Transportation Modeling Transportation Organizations and Agencies Travel Behavior and Research Water Transportation Systems

Download or read book Development of a Microscopic Traffic Simulation Model for Safety Assement of Signalized Intersections written by Minh Tan Dang and published by . This book was released on 2012 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improving Performance of Coordinated Signal Control Systems Using Signal and Loop Data written by Meng Li (Writer on traffic signs and signals) and published by . This book was released on 2010 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ITS operations Resource Guide 2003 written by and published by . This book was released on 2003 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Schedules for Traffic Signal Timing Optimization written by Byungkyu Park and published by . This book was released on 2005 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic signal optimization is recognized as one of the most cost-effective ways to improve urban mobility; however the extent of the benefits realized could significantly depend on how often traffic signal re-optimization occurs. Using a case study from the Northern Virginia Smart Traffic Signal System (NVSTSS), this project sought to determine how often traffic signals need to be re-optimized to provide the greatest benefits. This project developed a new traffic signal timing plan evaluation and optimization program by combining the Integrated SYNCHRO and Platoon Dispersion (ISAPD) model and the OptQuest optimization program. Based on 2001 (base scenario) and 2004 traffic data, five scenarios of re-optimization time intervals (i.e., 2 weeks, 4 weeks, 8 weeks, 16 weeks, and 1 year) were investigated. Study results indicate that (1) determining time intervals for re-optimization in the NVSTSS is feasible; (2) among the various re-optimization time intervals investigated for the Route 50 case study network, the time interval of 1 year was the best for both midday and the PM peak; and (3) the annual net savings from implementing this 1-year re-optimization time interval could be as high as $107,340 and $254,436, respectively, given the assumptions used in the study. The report recommends (1) the annual re-optimization of the Route 50 corridor traffic signal system; (2) the NVSTSS implementation of the combined ISAPS and OptQuest program for measuring "regrets" of not maintaining the optimal timing plan; (3) the adoption by VDOT traffic engineers of the methodology developed in this study, which is based on the combined ISAPD and OptQuest program, for making decisions regarding traffic signal re-optimization; and (4) a future study to investigate the impact of traffic volume growth rates and changes in turning movements as a means of assisting with determinations about traffic signal timing plan re-optimization.

Download or read book Traffic Management Simulation Development written by Mohammed Abdul Hadi and published by . This book was released on 2011 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project is to explore the development of methods and tools for the use of microscopic traffic simulation models to support the traffic management center (TMC) software implementation, operation, and testing on the one hand, and the use of Intelligent Transportation System (ITS) data to support the development and calibration of simulation models on the other. The project products include software utilities that use the existing TMC databases and other available information for the preparation and calibration of microscopic simulation tools. In addition, the products include utilities to support testing of the TMC software modules and data archiving processes, as demonstrated by use cases of the tools developed in this study.

Download or read book Application of Traffic Simulation Models written by and published by . This book was released on 1982 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Developing Calibration Tools for Microscopic Traffic Simulation written by H. Michael Zhang and published by . This book was released on 2008 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Developing Calibration Tools for Microscopic Traffic Simulation written by and published by . This book was released on 2008 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Its Test bed Using Microscopic Traffic Simulation written by Ilsoo Yun and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Integrated Meso microscale Traffic Simulation Software for Testing Fault Detection and Handling Algorithms in AHS Final Report written by Roberto Horowitz and published by . This book was released on 2003 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Algorithm based Combinatorial Parametric Optimization for the Calibration of Traffic Microscopic Simulation Models written by Tao Ma and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis outlines an implementation of Genetic Algorithms to traffic simulation optimization and development of a program called GENOSIM, a Genetic-based Optimizer for Traffic Microscopic simulation Models. GENOSIM is developed as a pilot software that employs the state of the art in combinatorial parametric optimization to automate the tedious task of calibrating traffic simulation models. The employed global search technique, Genetic Algorithms, is integrated with a dynamic traffic microscopic simulation modeler, Paramics, and experimented with Toronto network, Canada. The output of GENOSIM is the near-optimal values of its car-following, lane changing and dynamic routing parameters. Obtained results are promising. Paramics consists of high performance cross-linked traffic models having multiple user-adjustable parameters. Genetic Algorithms in GENOSIM will manipulate the values of control parameters and search an optimal set of values as starting configuration for these parameters by matching model outcome with observed data. The most of C++ codes shown here have been simplified for clarity.

Download or read book Transportation Research Record written by and published by . This book was released on 1996 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by University of Minnesota. Intelligent Transportation Systems Institute and published by . This book was released on 2002 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: