Noise in cities is a global problem which has been studied extensively around the world [1–14]. Today, urban noise is considered a public health problem [15–19]. Currently, the city of Curitiba (in southern Brazil) has a population of over 1.8 million [20], making it one of Brazil's and Latin America's largest metropolises. According to the National Traffic Department, the city has a vehicle fleet of 1,314,000, which is equivalent to a ratio of 0.73 vehicle /inhabitant.