Commuters heading home after work today should expect delays with heavy traffic congesting all motorways in and out of Auckland.

NZ Transport Agency's real-time traffic updates have indicated heavy traffic all over the city, which could be worsened by the wet weather.

On the Northern Motorway, traffic is heavy but easing northbound from Tristram Ave to Upper Harbour Highway. Citybound it is heavy between Northcote Rd and the Harbour bridge.

On the Southern Motorway, traffic is heavy southbound from Symonds St to Market Rd, again at Manukau, then from Manurewa to Takanini. Northbound it is heavy from Highbrook to Greenlane.

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On the Northwestern Motorway, westbound traffic is heavy between Rosebank Rd and Lincoln Rd, and citybound there is a queue from the Northern Link. However traffic at the Waterview Tunnel is currently flowing freely.

The Southwestern Motorway is heavy northbound between Portage Rd and Neilson St, and southbound approaching the Southern link.

While, Maraetai Coast Rd is under stop/go traffic control between Maraetai Dr and North Rd in Maraetai following a crash.

Some residents in Maraetai, Beachlands and Waiheke Island are also without power after a motorhome crashed down a bank.

A crane will be needed to get the vehicle back on to the road.

It could be several hours before the road is reopened and power restored.

Motorists are warned to avoid the area and take an alternative route.