State-specific vehicle noise emission characteristics

During the period of September 1999 through March 2000, the University of L ouisville Research Foundation conducted a series of reference energy mean e mission level (REMEL) measurements of individual vehicle operations in the state of Arizona. This study was conducted to determine if the noise emissi on characteristics of Arizona highway vehicles are consistent with the data contained in the Federal Highway Administration's Traffic Noise Model (TNM ). A comparison of the Arizona TNM REMELs with the Federal Highway Administ ration national TNM REMELs shows the two data sets are statistically differ ent at a 95% confidence level for all three vehicle types addressed in this paper.