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PMA neither loaded nor unloaded ships over the weekend, leaving yard and gate operations up to individual terminals.
Draymen say they could be forced out of business by huge demurrage and detention bills.
Ports using contingency anchorages as number of ships waiting for berths grow.
Sales, hiring and capital expenditures are expected to rise, according to a Business Roundtable survey.
Congressional watchdog agency told Senate lawmakers that FMCSA should enhance its Safety Measurement System for motor carriers.
Containers in stack at Centerm contained trichloroisocyanuric acid, according to the terminal operator.