Autos include all passenger cars, including station wagons. The U.S. Bureau of Economic Analysis releases auto and truck sales data, which are used in the preparation of estimates of personal consumption expenditures.

The Bureau of Transportation Statistics releases non-seasonally adjusted air traffic data based on monthly reports from commercial U.S. air carriers.

Employed persons include people aged 16 years and older in the civilian noninstitutional population who did any work at all as paid employees; worked in their own business, profession, or on their own farm, or worked 15 hours or more as unpaid workers in an enterprise operated by a member of the family; and all those who were not working but who had jobs or businesses from which they were temporarily absent. The Bureau of Labor Statistics produces industry estimates of nonfarm payroll employment as part of the Current Population Survey.

The Federal Highway Administration estimates vehicle miles traveled on all roads and streets in each month.

Heavy trucks include trucks with more than 14,000 pounds gross vehicle weight. Prior to the 2003 Benchmark Revision heavy trucks were more than 10,000 pounds. The U.S. Bureau of Economic Analysis releases auto and truck sales data, which are used in the preparation of estimates of personal consumption expenditures.

General aviation fatalities include private aviation operations and excludes Federal Aviation Regulation (FAR) Part 121 (Air Carriers), 129 (Foreign), 135 (On-Demand), and Non-U.S./Commercial operations. The National Transportation Safety Board releases aviation fatality data in the Aviation Accident Database.

The Bureau of Transportation Statistics calculates this value using system data provided by CitiBike NY/JC (New York, NY and Jersey City, NJ), Capital Bikeshare (Washington, DC area), Divvy (Chicago, IL), Bay Wheels (San Francisco, CA), and Blue Bikes (Boston, MA area).

Urban rail includes heavy rail, commuter rail, light rail, streetcar rail, and hybrid rail. The Federal Highway Administration estimates monthly transit ridership, released as part of the National Transit Database. Ridership estimates have been adjusted to account for changes in data collection over time. Starting in January 2012, data for Small System Waiver agencies that do not have a mode are reported under motor bus. Data reported under hybrid rail are reported under their classifications prior to January 2012.

A monthly measure of the volume of services performed by the for-hire transportation sector. The index covers the activities of for-hire trucking, freight railroad services, inland waterway traffic, pipeline movements, and air freight.

Regular gasoline price is the average retail price for regular grade formulations. The U.S. Energy Information Administration releases weekly gasoline and diesel price estimates.