What are the reasons for port congestion?

岁末盘点：港口拥堵为哪般?。

youdao

Port congestion surcharges， if any， at the time of shipment is for opener’s account。

装运时如产生港口拥挤费，须由开证人承担。

youdao

Oil lighterage at sea might help alleviate the situation of port congestion and tap the potential of logistic development for national crude oil import.

通过海上原油船对船过驳，是缓解这一矛盾、发掘进口原油物流中发展潜力的新环节。

youdao

But distribution is being slowed by congestion at the Port-au-Prince airport, rubble-filled streets and security problems.

VOA: standard.2010.01.16

Incoming dirty ships would have to transfer their cargo or be cleaned, which takes time, and cleaning the ships could create delays and port congestion.

FORBES: The Gulf Spill: Now What?

Mr Ware said plans for lorry parking would "greatly assist in easing congestion in and around the port at peak operating times".

BBC: Holyhead truck stop and logistics depot plan submitted