The SR 85 freeway was constructed in two different eras: the northern portion of the corridor was constructedin the 1960s (north of I-280) and the southern portion of the corridor was constructed in the early 1990s(south of I-280). Per the Santa Clara County Ordinance, Sec. B17-5.4, trucks were banned on SR 85 south of I-280 when the newer southern portion of the corridor was opened to traffic to eliminate the additional noisethat truck traffic would generate. However, as traffic volumes have continued to increase on SR 85, noiselevels have increased too, and adjacent communities have requested better noise abatement. Caltrans hasdeveloped new acoustic measurement techniques and studied options to better reduce noise levels.
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