Abstract
This article describes the Federal Highway Administration (FHWA) Traffic Noise Model (Registered trademark) (TNM), which was developed to help in complying with policies and procedures under U.S. regulations. The TNM is a state-of-the-art computer program for predicting noise impacts in the vicinity of highways and for designing efficient, cost-effective highway noise barriers. The current model is Version 2.5. The Volpe National Transportation Systems Center is conducting a long-term study to quantify and assess the model's accuracy and to make recommendations for use.