According the latest Economic Census (2002), the trucking industry is the largest contributor of revenue in the transportation sector, contributing more than one-quarter of the sectors revenue. The air industry contributes just under one-quarter, as does other transportation and support activities, which include sightseeing, couriers and messengers, towing services, port and airport operations, and other support activities.
Transportation Sector Revenue by Industry, 2002 Economic Census
|Industry||Billion Dollars||Share of Total|
|Other Transportation & Support Activities||75.5||22.9%|
|Warehousing & Storage||26.1||7.9%|
|Transit & Ground Passenger Transportation||14.4||4.4%|
Source: National Academy of Sciences, Technologies and Approaches to Reducing the Fuel Consumption of Medium and Heavy-Duty Vehicles, prepublication copy, March 2010, p. 1-8.