Trucking demand decreased again in April.

The American Trucking Associations’ seasonally-adjusted truck tonnage index — a key measure of freight carried by commercial trucks in the U.S. — fell 2.1 percent in April from March.

“There is still an inventory correction transpiring throughout the supply chain that will keep a lid on truck freight volumes in the near term,” said Bob Costello, ATA’s chief economist. “As a result, we are still likely to experience lackluster tonnage numbers in the next few months.”

Even as freight remained soft in April, the outlook for tonnage is a little better than a couple of months ago, Costello said.

This year started off with a 1.4 percent dip in January, followed by an abnormally large 7.2 percent increase in February, and a sharp 4.4 percent decline in March.

However, freight tonnage is up 3.5 percent through the first four months of this year compared to the same period last year.