A UPS driver steps onto to his truck in Evanston, Illinois, March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT)