American Trucking Associations' advanced seasonally adjusted For-Hire Truck Tonnage Index increased 3.6 percent in May after decreasing 1 percent in April. In May, the index equaled 115.9 (2015=100) compared with 111.9 in April.

"May was the first month since February 2023 that tonnage increased both sequentially and from a year earlier," said ATA Chief Economist Bob Costello. "While there was clearly an increase in freight before the Memorial Day holiday, it is still too early to say whether this is the start of a long-awaited recovery in the truck freight market."

April's decrease was revised up slightly from the May 21 press release.

Compared with May 2023, the index rose 1.5 percent, the first year-over-year gain in fifteen months. In April, the index was down 1.3 percent from a year earlier.

The not seasonally adjusted index, which represents the change in tonnage actually hauled by the fleets before any seasonal adjustment, equaled 120.4 in May, 7.1 percent above April. ATA's For-Hire Truck Tonnage Index is dominated by contract freight as opposed to spot market freight.