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.

Passengers transported on Amtrak and Alaska Railroad operations. The Federal Railroad Administration collects accident/incident and operational data from railroads. Tourist and commuter railroad are excluded.

On-highway diesel price is the average retail price for diesel used in motor vehicles. The U.S. Energy Information Administration releases weekly gasoline and diesel price estimates.

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.

National Highway Traffic Safety Administration releases data on highway fatalities in the Fatality Analysis Reporting System (FARS). Data for the most recent year are preliminary estimates.

Gross domestic product is the market value of goods and services produced by labor and property in the United States. The U.S. Bureau of Economic Analysis estimates GDP for each quarter and releases new statistics every month. Quarterly GDP data are seasonally adjusted at annual rates.

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 Estimates for the most recent month are based on lock performance management data and will be superseded by actual data as it becomes available.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.

Number of trucks entering the United States from Mexico. The Bureau of Transportation of Statistics releases incoming border crossing statistics using data collected at ports of entry by U.S. Customs and Border Protection.

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

National Highway Traffic Safety Administration releases data on highway fatalities in the Fatality Analysis Reporting System (FARS). Data for the most recent year are preliminary estimates.