International Journal of Energy and Environment

ISSN: 2308-1007
Volume 13, 2019

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 13, 2019

Title of the Paper: The Impact of a Ring Road in an Urban Road Network. The Case Study of Guimarães, Portugal


Authors: Paulo J. G. Ribeiro, Luís A. P. J. Gonçalves

Pages: 8-13

Abstract: The high traffic volumes are a main source of the congestion in Cities, they are a big problem on urban road transportation systems. This congestion is the main cause of the increase of level of noise and air pollution in urban centers which directly affects the quality of life of the population. Also, contributing to the big number of vehicle conflicts that affects the performance of the urban road transportation systems and the quality of life of the population. These problems are the result of the high volumes of the through traffic. Therefore, to reduce the traffic volume in urban center of Guimarães, Portugal we studied a possible conclusion of the ring road, on the slope of the Penha hill for the peak hour of the morning. To carry out our study was estimated the Origin – Destination Matrix for peak hour from the data of traffic counts. Concluding the traffic volume in the section of the ring road already built there was a reduction. However, in the city center there were no major variations of the traffic volume.

Title of the Paper: Analysis of Road Safety Conflicts. The Case Study of a Road Interchange in Guimarães


Authors: Carlos Miguel Cardoso Araújo, Paulo Jorge Gomes Ribeiro, Flávio José Craveiro Cunto

Pages: 1-7

Abstract: In recent days, microsimulation is use as an auxiliary designing tool to improve traffic efficiency and safety in road networks, especially in road intersections and interchanges, avoiding in situ experiences. However, it is necessary that the model have a good adjustment to reality, in order to obtain results that best fit traffic behavior and performance in the road network. In this sense, using microsimulation, more precisely the VISSIM software, will allow to model traffic at a microscopic level and evaluate the parameters that most influence the route of the vehicles within traffic flows. To calibrate the traffic model, some traffic flow parameters should be modified according the modeler experience in order to obtain a virtual model as close to reality as possible. The most appropriate criteria for the calibration and validation of the traffic model will applied in a case study of an interchange in the road network of the city of Guimarães, Portugal. Road safety in the interchange will also be analyzed using the SSAM (Surrogate safety assessment model) software, and the network points of conflict will be analyzed and characterized according the category and severity. Finally, a sensitivity analysis will be introduced, where some flow parameters will be modified, individually or together, in order to assess their influence on traffic and safety performance for the case study of the road interchange.