One of biggest US ports will start operating 24 hours a day to try to clear long queues of cargo ships stuck waiting outside.
It comes as officials scramble to ease global supply issues that may lead to goods shortages this Christmas.
The Port of Los Angeles in California will handle more goods at night after a similar move by nearby Long Beach port.
The ports - which handle 40 per cent of all cargo containers entering the US - have faced months of problems.
Major US firms such as Walmart and FedEx have also committed to increasing their round-the-clock operations to help clear the jam.