Abstract
Approximately 270 recordings of noise levels were obtained at 39 highway sites and compared with the predictions of noise levels based on the procedure given in a National Cooperative Highway Research Program report on highway noise. The measured noise levels were computed in terms of the A-weighted L sub 10 value (level exceeded 10 percent of time) and then compared with the predicted noise levels. A significant discrepancy was found between predicted and measured noise levels. Generally, the predicted values exceeded the measured values. Average error per location was 4.8 dBA/ the maximum error was 13 dBA. A nomograph was devised to correct the predicted value/ this nomograph involves observer-roadway distances, truck volumes, and automobile speeds. Application of the correction factors reduced the average error by 60 percent to 1.9 dBA. Based on these findings, the nomograph was approved by the Federal Highway Administration for use in predicting noise levels in Kentucky.
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