FILE - This May 6, 2006 file photo shows two cyclists riding 

FILE - This May 6, 2006 file photo shows two cyclists riding along the 13-mile-long scenic drive at Red Rock Canyon National Conservation Area in Nevada. These towering red sandstone cliffs, some reaching 3,000 feet, is just 15 miles west of metropolitan Las Vegas. (AP Photo/Jae C. Hong, file)
Associated Press
FILE - This May 6, 2006 file photo shows two cyclists riding along the 13-mile-long scenic drive at Red Rock Canyon National Conservation Area in Nevada. These towering red sandstone cliffs, some reaching 3,000 feet, is just 15 miles west of metropolitan Las Vegas. (AP Photo/Jae C. Hong, file)
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