Influence of traffic control devices on sound pressure level variation in urban roundabouts

Abstract

Urban planning changes often overlook noise impacts, leading to increased noise levels. Specifically, accelerations and decelerations at roundabouts and signalized intersections can intensify sound emissions. However, analyzing noise in roundabouts presents challenges due to traffic flow complexity. In this context, this research evaluates how the installation of traffic signals in urban roundabouts can contribute to increased road traffic noise. The method consists of noise monitoring conducted at three urban roundabouts. The results show that the presence of traffic signals increases noise levels around roundabouts, even when traffic flow is lower at the signalized point. Additionally, exit lanes are noisier than entry lanes on the same avenue converging at the roundabout. This study highlights the importance of environmental acoustics in urban planning changes.