Congestion is heavy on Auckland's Southern Motorway following an incident near the Gillies Ave off-ramp earlier this evening.
The left-hand lane was closed for a short time but has since been cleared but motorists are being told to expect significant delays.
A police spokesperson said one person was being treated by ambulance staff "but there was nothing in the job to indicate it was serious".
The incident occurred around 30m before the off-ramp and only one car was involved.
There is another heavy traffic patch at Manukau further south, meanwhile, traffic is also heavy between Mt Wellington and the city.