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Abstract
Approximately 270 noise-level recordings were obtained at 39 highway sites and compared with the noise-level predictions obtained by the procedure outlined in NCHRP Report 117. The measured noise levels were computed in terms of the A-weighted L10 value (level exceeded 10 percent of time) and then compared to 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-to-roadway distances, truck volumes, and automobile speeds. By applying correction factors, the average error was reduced to 1.9 dBA, a 60-percent reduction in error. Based on these findings, the nomograph was approved by the Federal Highway Administration for use in predicting noise levels in Kentucky.
Report Date
11-1974
Report Number
No. 409
Digital Object Identifier
http://dx.doi.org/10.13023/KTC.RR.1974.409
Repository Citation
Agent, Kenneth R. and Zegeer, Charles V., "Evaluation and Modification of the Traffic Noise Prediction Procedure for Kentucky Highways" (1974). Kentucky Transportation Center Research Report. 890.
https://uknowledge.uky.edu/ktc_researchreports/890
Notes
Accepted for publication by the Transportation Research Board.