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FILE - In this Sept. 8, 1972 file photo, cars pass by on Interstate 90, into the Black Hills in Murdo, S.D. After rising continuously since World War II, driving by American households has declined nearly 10 percent since 2004. (AP Photo/File)

FILE - In this Sept. 8, 1972 file photo, cars pass by on Interstate 90, into the Black Hills in Murdo, S.D. After rising continuously since World War II, driving by American households has declined nearly 10 percent since 2004. (AP Photo/File)

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