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The NZ Transport Agency said the heavy traffic and delays were caused by "unplanned service maintenance", which resulted in the closure of one lane.
A motorist who was stuck in traffic said they ended up sitting through a whole cycle of green lights before being able to get through the intersection.
Congestion was also affecting southbound motorists.
A southbound motorist said it took 20 minutes to get from the Dunedin Botanic Garden to Albany St.
"There was no escape as Dundas St is blocked off because they are still working on the bridge," he said.