Emergency services are responding to a car fire on the Auckland Harbour Bridge.

A Fire and Emergency spokesperson said they were called to a car well involved in fire, on the north bound side of the bridge.

He said crews were working in the outside lanes, at the top of the bridge.

The fire had been extinguished and a tow truck had been called.

A police spokesperson said the northbound 'clip on' lanes are currently blocked and traffic is being diverted to the middle lane.

Significant delays are expected and police encourage motorists to avoid the area if at all possible.