Rail carload traffic is comprised of mostly bulk commodities, such as coal and agricultural products. The Association of American Railroads releases data on carloads and intermodal units originated by U.S. railroads on a weekly and monthly basis.

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's National Highway Construction Cost Index (NHCCI) is a quarterly price index intended to measure the average changes in the prices of highway construction costs over time and to convert current-dollar highway construction expenditures to real dollar expenditures.

Customer on-time performance is the percentage of customers who arrive at their detraining stations on time. An Acela train is late when it arrives at a station more than 10 minutes after its scheduled time; a Northeast Regional or State-Supported train is late when it arrives more than 15 minutes after its scheduled time. For years before FY 2018, on-time performance is the percentage of total train arrivals on-time at each station, with every arrival weighted equally. Amtrak reports system performance in monthly Host Railroad Reports.

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

A monthly measure of the volume of services performed by the for-hire transportation sector. The index covers the activities of local mass transit, intercity passenger rail, and passenger air transportation.

Freight and mail carried by U.S. airlines in all service classes (schedule and nonscheduled) on domestic flights. The Bureau of Transportation Statistics collects air traffic data from U.S. air carriers and international carriers operating within the U.S.

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.

A monthly measure of the volume of services performed by the for-hire transportation sector. The index covers the activities of for-hire freight carriers and for-hire passenger carriers.

An estimate of tonnage transported on navigational channels of the United States. Estimates for the most recent month are based on lock performance management data and will be superseded by actual data as it becomes available. The Waterborne Commerce Statistics Center estimates tonnage based on tonnage reported through the lock performance monitoring system.