A nine-car crash in heavy fog on Auckland's Greenhithe Bridge is causing some delay for north-bound motorists.

The multiple nose to tail collision occurred shortly before eight this morning.

A police spokesman said no-one was injured in the accident.

However, traffic was backed up to Squadron Drive on the Upper Harbour Highway as the site was cleared.


He said police were currently in attendance.

Motorists were being urged to exercise caution and be prepared for some delays.

The spokesman said there was also still a bit of fog around impairing visibility.