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California motor vehicle noise laws have established step-dawn <br /> maximum noise levels which manufacturers must meet to sell <br /> all types of vehicles in the State. These have provided an <br /> impetus to manufacturers to reduce noise levels of motor vehicles, <br /> and much research is being directed toward better muffling of <br /> exhaust, quieter tire designs, and quieter and better enclosures <br /> around engines . The Federal Government will be preempting states <br /> from setting such noise limits governing the sale of products. <br /> However, they are adopting standards identical to present Calif- <br /> ornia requirements regarding truck noise levels. No standards for <br /> other motor vehicles have as yet been proposed. (California <br /> regulations remain in effect until federal standards are adopted. ) <br /> Trucks <br /> Noise emitted by a truck has several principal components: exhaust, <br /> engine, gears, fan and air intake. In addition,at higher speeds, <br /> tire and wind noise add to the problem. Thus , reducing truck <br /> noise is a complicated problem. <br /> With present technology, most existing trucks can be quieted to <br /> 86 dBA @ 501 .1 Several truck manufacturers estimate the costs <br /> to meet the 1973 California State limit of 86 dBA ranges from <br /> $20 to $125 per vehicle.2 California Division of Highways research <br /> estimates costs to further reduce noise from new trucks to 84 dBA <br /> @ 501 would be approximately $500 to a standard model cost of <br /> $20,000.3 Truck manufacturers state there are technical obstacles <br /> -And litay be as ::such as a 15% increase in costs to reduce noise <br /> levels significantly lower. Certainly, in the near future, these <br /> 4-5 <br />