The value of U.S. surface transportation trade with Canada and Mexico fell 5.9 percent in April from March, but increased over the previous year.
The 24.1 percent increase is the largest year-over-year rise on record but freight value remained 14.3 percent less than in February 2008.
78 members of Congress complained to U.S. Transportation Secretary Ray LaHood and U.S. Trade Representative Ronald Kirk about "unsafe" Mexican trucks.
Congressional leaders and trade groups are pushing federal leaders to resolve the cross-border trucking program with Mexico.
The increase was the first over the same month of the previous year since September 2008.
U.S. surface transportation trade declined both from a year earlier and from October.
Freight stabilization is a reflection of the recession coming to an end, analysts said.
Sign up to get Overdrive's daily newsletter.