The state of landed transportation costs and the risk for detention, demurrage, and per diem charges depend on the balance between drayage truck turnaround, or turn times, and port activity. As explained by Michael Angell of JOC.com, a recent report found that US imports might be subject to detention and demurrage charges in excess of $2,500. That’s more than triple the global average and, depending on the port, the charges might vary significantly. And these detention charges in shipping increase with demand.