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Fog restrictions have been lifted at Auckland Airport following the cancellation of three flights this morning.
Airport spokesman Simon Lambourne said the weather had cleared and the fog restrictions were lifted at 8.45am.
Three domestic regional flights had been cancelled and three had been delayed after fog restrictions were put in place at the airport at 4.38am this morning.
International flights were not affected, Mr Lambourne said.
Passengers were advised to check the airport's website www.aucklandairport.co.nz for the latest flight arrival and departure information.
MetService duty forecaster Tom Bell said the "radiation fog" had been caused by a humid air mass contrasting with cooler ground temperatures.
Radio New Zealand reported that some Auckland harbour ferry crossings had also been delayed.
A police spokesman said a few minor crashes had occurred around the Auckland region this morning but it wasn't possible to say whether they were the result of fog.
"We had a crash reported up on the Northern Motorway between Oteha Valley and Bawden Rd hearing north - a nose-to-tail. There's no report of injury at this stage. I can't say whether we can blame the fog on it or not," he said.
The NZ Transport Agency warned Auckland motorists to take extra care at East Tamaki Rd and Springs Rd intersection as a collision had taken out the traffic lights at the intersection. No one was injured in the crash and the car was being towed from the scene, the police spokesman said.
Motorists were advised to drive with caution.