**Mariano Gallo**

Department of Engineering, University of Sannio, 82100 Benevento, Italy; gallo@unisannio.it

Received: 3 July 2020; Accepted: 28 July 2020; Published: 29 July 2020

**Abstract:** In this paper, a piecewise-defined function is proposed to estimate traffic noise in urban areas. The proposed approach allows the use of the model even in the case of very low or zero flows for which the classical logarithmic form is not suitable. A model based on the proposed approach is calibrated for a real case and compared with the results obtained with a model based only on the logarithmic form. The results obtained show how the proposed piecewise-defined function, linear for low traffic flows and logarithmic for medium-high volumes, is able to better represent real noise pollution levels in all conditions. The proposed approach is particularly useful when comparing two plan scenarios from the point of view of noise effects.

**Keywords:** noise models; traffic noise; urban roads; sustainable mobility
