A vintage Shell fuel pump is displayed at the Iowa 80 trucking museum in Walcott, Iowa
A vintage Shell fuel pump is displayed at the Iowa 80 trucking museum in Walcott, Iowa July 12, 2012. The Iowa 80, located along Interstate 80, is said to be the world's largest truck stop. REUTERS/Adrees Latif (UNITED STATES - Tags: SOCIETY TRANSPORT)