April 2021 Trucking Marginally Declined Written by Steven Hansen Headline data for the CASS Freight Index show that truck volumes show volumes slowed month-over-month - but the year-over-year growth is now in double digits. In the opposite corner, the American Trucking Association (ATA) index also declined but is finally in expansion now year-over-year. Analyst Opinion of Truck Transport The CASS index is inclusive of rail, truck, and air shipments. The ATA truck index is inclusive of only trucking industry member movements (ATA's tonnage data is dominated by contract freight). I put a heavier weight on the CASS index year-over-year which is more consistent with rail and ocean freight.