The first crash was fullly cleared by 11.30am, according to the NZTA, but the crash on the Harbour Bridge meant the delays through St Marys Bay back to Spaghetti Junction continued.
The advised motorists to allow extra time and consider using the Northwestern Motorway instead.
Auckland Transport had warned passengers that they should expect delays to bus services because of the first crash.
NZTA's highway map showed traffic backed up all the way to Spaghetti Junction with the queue only moving about 4km/h in parts and a photo showed the long tail of traffic behind it.
"A crash is blocking two right lanes northbound in St Marys Bay, prior to the Akl Harbour Bridge. Pass with extra care and expect delays from Spaghetti Jctn."
A police spokeswoman said police were alerted to the first crash at 10.10am involving a car and a motorbike. One person had reported moderate to minor injuries.