Freight shipments across all U.S. domestic modes continued improving in August but remain weak, according to the latest Cass Freight Index, while freight spending moved lower again with both resulting in mixed feelings when it comes to their economic impact. Its measure of shipments increased 0.4% compared to July for a reading of 1.115, the highest level since last September, but is down 1.1% from August 2015, the 18th straight year-over-year decline.