Origin: California Date: December, 1993 Categories: Noise Key Words:
Summary: The acoustical consulting firm of Brown-Buntin Associates, Inc. (BBA) was retained by the Sacramento County Department of Public Works to study Alta Arden Expressway traffic noise levels before and after paving with rubberized asphalt. The purpose of this study was to describe the reduction in Alta Arden Expressway traffic noise levels which resulted from the use of rubberized asphalt concrete. The project study corridor extended from Howe Avenue to Watt Avenue, as shown by Figure 1. Several similar studies, conducted in France, West Germany, Belgium, Austria and the U.S. (Arizona), have reported traffic noise level reductions ranging from 3 dB to 10 dB following repaving with rubberized asphalt. The wide range of reported noise level reductions is probably due in part to varying levels or roadway degradation prior to resurfacing, differences in heavy truck usage, and varying composition of the rubberized asphalt. Regardless, a noise reduction of at least 3 dB was reported for each study. A 3 dB decrease in traffic noise levels is comparable to the effects of a 50% reduction (or halving) in traffic volume, and is considered to be a perceptible decrease in noise levels.