The seasonally adjusted index equaled 144.1 for the month, up from 135.3 in April.
Compared to May 2016, the seasonally adjusted index rose 4.8 percent, which was the largest year-over-year gain since November, the ATA said.
For the first five months of 2017, the index was up 0.9 percent from the corresponding 2016 period, while for the full year in 2016, tonnage was up 2.5 percent from 2015.
The not seasonally adjusted index, which represents the change in tonnage actually hauled by the fleets before any seasonal adjustment, equaled 145.3 in May, up 8.5 percent from the previous month.
“After three straight declines totaling 2.6 percent, truck tonnage snapped back in May,” said ATA Chief Economist Bob Costello. “One month does not make a trend, but the nice gain last month fits more with the anecdotal reports I’ve been hearing from fleets, at least more so than three straight months of decreases.
“Despite the robust jump in May, I still expect moderate growth going forward as key sectors of the economy continue to improve slowly,” he added.
ATA also noted that part of May’s report revises its April decline in the index to a 1.5 percent dip instead of the previously reported 2.5 percent drop.
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The Signal at Chattanooga Choo Choo • Chattanooga, TN Register NowThe night before F3. FreightTech100 companies honored. FreightTech 25 and Shipper of Choice winners revealed live. Cocktail reception into dinner and live music - 300 industry leaders in one purpose-built room.
The Signal at Chattanooga Choo Choo • Chattanooga, TN Register NowIndustry-defining keynotes, rapid-fire technology demos, and industry leaders networking in experiences across Chattanooga - plus the inaugural F3 Awards Dinner featuring the FreightTech and Shipper of Choice reveals.
The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now