The motorcyclist's injuries were too severe to treat, said Fisher, who said he and a couple of other people put a blanket over the woman. The motorcylist lost consciousness before the emergency services arrived 5 to 10 minutes later.
"It was pretty ghastly," said Fisher.
He did not see the crash and did not know what caused it, but believed motorcyclists needed to take more care.
"I've seen it time and again. Motorcyclists passing cars, weaving in and out, and this is what happens. They should go with the flow and not weave in and out of the traffic," said Fisher, who owns a paint contracting company.
Fisher also helped get one lane open during the morning rush hour until the police arrived.
One person was seriously injured in the crash, which happened near the Panama Rd overbridge in Mt Wellington.
Police said two lanes initially blocked by the crash have now been cleared but the NZ Transport Agency warned drivers toallow extra time for congestion - or consider an alternative route.
