Traffic Noise Prediction

The National Cooperative Highway Research Program has developed a series of documents (NCHRP 117, NCHRP 144, and NCHRP 174) that provides design guidance to predict and control highway noise. These documents are widely used because of their simplicity and relatively high success in accurately predicting noise. The NCHRP 174 procedure is the last revision in the series. The Federal Highway Administration produced a more detailed and empirically correct version of this model in 1978.

Computer programs are available to predict noise levels generated by a proposed project. They can be used to determine the noise impact on surrounding areas. These programs (hand calculations are possible for simple cases) can determine the noise levels at distances away from the

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