Impactos da redução de velocidade na via rápida e rótulas da cidade de Viseu, Portugal: um estudo de caso sobre a análise de capacidade e segurança viária

Abstract

This study delved into examining the viability of decreasing the speed limit from 50 km/h to 40 km/h on the N2 ring road, a major thoroughfare in the city of Viseu, Portugal. Employing the AIMSUN traffic microsimulator and capacity calculations based on TRL and DNIT methodologies, the research also encompassed the analysis of seven roundabouts along this route. Vehicle count data were systematically gathered to examine the origin-destination matrix of each roundabout. The findings revealed that the roundabouts exhibited a favorable capacity, indicating available space for accommodating additional vehicles. Microsimulation results demonstrated that the speed reduction positively impacted traffic flow at certain roundabouts, manifesting in decreased waiting times. However, at other locations, the reduction showed insignificant influence. In conclusion, the study affirmed that lowering the speed limit proved highly advantageous for road safety, resulting in a possible reduction in accidents and fatalities. Remarkably, these safety enhancements were achieved with minimal repercussions on the overall performance of the roundabouts. This research contributes valuable insights into traffic management strategies and safety considerations for urban road networks.