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Flexi-Van executive says "misplaced" chassis have aggravated congestion.
Move comes as ILWU, PMA talks enter 10th month.
Labor Secretary Thomas Perez met both parties accompanied by a mediator from the Federal Mediation and Conciliation Service who has been assisting in the talks since early January.
On-time performance is being hampered by congestion at West Coast ports.
DHS funding crisis means the agency will have to focus resources on border security, cargo clearance
The revised agreement would allow collaboration on congestion, transportation infrastructure needs and pollution mitigation.