Transportation Services Index sets record in May

The U.S. economic indicator measuring the total output of for-hire transportation industries rose to its highest level in 14 years in May 2004, according to the U.S. Department of Transportation. The Transportation Services Index measures the movement of freight and passengers. An increase in the index means more goods and people are traveling the nation's infrastructure network. According to the U.S. DOT, the index will help to "understand the relationship of transportation to long-term changes in the economy."