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Seasonally Adjusted Transportation Data
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Seasonally-adjusted truck tonnage - U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) calculation from American Trucking Association Monthly Truck Tonnage Report
Release Notes - BTS is withholding the scheduled release of the passenger and combined indexes for January. The passenger index is a statistical estimate of airline passenger travel and other components based on historical trends up to December 2019. As a result, the estimates have yet to fully account for the impact of the coronavirus. Air freight is also a statistical estimate. Since air freight makes up a smaller part of the freight index, the freight TSI is being released as scheduled.