Port congestion rebounded last week after a brief improvement at Chinese ports as the number of ships waiting at anchorages have picked up sharply especially in Shanghai and Ningbo where vessel waiting times have risen to up to 4 days. High cargo traffic and vessel bunching on arrival has caused congestion to build up, with activity boosted by cargo front loading ahead of December rate hikes and potential US East Coast labour strife. The expectation for more cargo to be shipped ahead of the impl