The California Department of Transportation (Caltrans) is required by standards to predict noise levels for proposed federal aid highway projects. For these predictions Caltrans uses national vehicle noise reference emission levels, which are based on 1975 data collected in North Carolina, Florida, Washington, and Colorado. In 1982, Caltrans initiated a study in response to the need for California data. The report presents criteria, methods and analyses used to develop California vehicle noise emission levels for level roads and heavy truck emission levels on grades. More than 3000 noise and environmental measurements were made at sixteen level road sites in California. Included were automobiles and medium and heavy trucks traveling at constant speeds between 25 and 65 mph. Microphones were located at distances of 25, 50 and 100 feet, and at heights of 5 and 10 feet. Nearly 1800 measurements were made of heavy truck noise at constant up hill speeds from 10 to 65 mph at six road sites ranging in grade from +3% to +7%.
California Vehicle Noise Emission Levels. Final Report 1982-1987
1987
281 pages
Report
No indication
English