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Nearly eliminating the sulfur in diesel fuel will be the key to this step just as removing lead from gasoline was the key to cleaning up cars 20 years ago . At times crews will close all lanes for up to 20 minutes while pulling rocks and trees off the hillside . Equipped with top-quality copper cable , gold-plated plugs , and three sizes of contoured silicon earbuds , the earphones deliver a frequency response of 20Hz to 20KHz , sensitivity of 115 dB , and noise isolation of up to 20 dB . Skip protection works by continually preloading up to 20 minutes of music into the cache , so your iPod is not affected by sudden movements.The 10GB and 20GB iPod models include a clip-on wired remote control that lets you fast-forward or rewind a track , play , pause and adjust volume using just one hand . As a thank you , you 'll receive a Times Union SourceCard , good for up to 20 % off at over 200 restaurants , entertainment and service venues . Now it receives 3 million hits per month , and may be up to 20 million in the near future .