Transportation Services Index Shows Monthly Change in Freight and Passenger Transportation Service

摘要

The TSI provides a monthly measure of freight and passenger service. Statistical and economic techniques are used to present the output of the different transportation modes in comparable terms, adjusted to correct for the seasonal nature of transportation. The TSI consists of two indexes, a freight TSI and a passenger TSI, which are then combined into a total TSI. Using 2000 as a base year with an index value of 100, the overall TSI has ranged from a value of 66 at the beginning of 1990 to approximately 110 at the end of 2006, reflecting an increase of nearly 70 percent over 17 years.