Publicação
Evaluation of traffic performance at roundabouts
| Resumo: | Roundabouts have evolved into one of the most common forms of crossings. Their success in resolving traffic issues and enhancing junction performance has been critical to their adoption. In ancient times, roundabouts were the subject of study by many scientists who transformed the traffic principles by which they were governed and today they are considered one of the most widely implemented alternatives worldwide. Speed reduction, greater safety, shorter wait times, and higher capacity as compared to any other at-grade junction. These characteristics have resulted in their deployment all over the world. This dissertation aims to study and compare the performance of various models to assess the capacity of a roundabout. Thus, a comparison of the capacity calculation models developed in different countries to estimate the performance of roundabouts is done, relying its assessment on numerous elements ranging from geometric attributes to driving behaviour. Furthermore, several performance measures such as delay, degree of saturation, and others are evaluated, which will allow comparing empirical, analytical and simulation models. In this work, a microsimulation model for roundabouts with the application of the PTV VISSIM software is applied. Vissim is considered a tool that simplifies road network research and analysis. allowing to analyze the performance of a roundabout through the evaluation of several indicators in different parts of the roundabout such as entries, exits and conflicting carriageway. Finally, a case study of the roundabout performance in the city of Guimaraes, Portugal, under its geometric and traffic features is done based on real traffic data. |
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| Autores principais: | Acosta, Yoimer Miguel Cassiany |
| Assunto: | Intersection Roundabout Performance Model Capacity Microsimulation Traffic and geometric characteristics Intersecção Rotunda Desempenho Modelo Capacidade Microssimulação Tráfego e características geométricas Engenharia e Tecnologia::Engenharia Civil |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Roundabouts have evolved into one of the most common forms of crossings. Their success in resolving traffic issues and enhancing junction performance has been critical to their adoption. In ancient times, roundabouts were the subject of study by many scientists who transformed the traffic principles by which they were governed and today they are considered one of the most widely implemented alternatives worldwide. Speed reduction, greater safety, shorter wait times, and higher capacity as compared to any other at-grade junction. These characteristics have resulted in their deployment all over the world. This dissertation aims to study and compare the performance of various models to assess the capacity of a roundabout. Thus, a comparison of the capacity calculation models developed in different countries to estimate the performance of roundabouts is done, relying its assessment on numerous elements ranging from geometric attributes to driving behaviour. Furthermore, several performance measures such as delay, degree of saturation, and others are evaluated, which will allow comparing empirical, analytical and simulation models. In this work, a microsimulation model for roundabouts with the application of the PTV VISSIM software is applied. Vissim is considered a tool that simplifies road network research and analysis. allowing to analyze the performance of a roundabout through the evaluation of several indicators in different parts of the roundabout such as entries, exits and conflicting carriageway. Finally, a case study of the roundabout performance in the city of Guimaraes, Portugal, under its geometric and traffic features is done based on real traffic data. |
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