Thousands of cargo trucks had been stuck for neary 20 hours as of Wednesday morning around ports in Hai Phong, the major port city in northern region.
The trucks were about to enter or had just left Chua Ve and Dinh Vu Ports when they got stuck.
Several ships waiting for their cargo thus had to wait at the ports.
Drivers said traffic jams around the area has been happening for several years and have worsened of late.
The amount of cargo transported through Hai Phong ports has increased but roads leading to the ports have not been expanded or improved, they said.
Some parts of the roads have been severely damaged and have been blocked for repairs.