Some unruly woollies are causing delays for commuters on Auckland's Northern Motorway.

NZ Transport Agency earlier reported heavy northbound traffic between the Harbour Bridge and Redvale due to several sheep that are on the loose.

A breakdown is also blocking the left lane after Victoria Park Tunnel.

Meanwhile, traffic is also heavy citybound with reports that a car has flipped after Bawden Rd overbridge and is blocking lanes.

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On the Southern Motorway, southbound traffic is heavy but easing from Manurewa to Takanini.

For motorists on the Northwestern Motorway, be wary of sunstrike heading westbound.

Kahiktea Flat Rd is now open between SH16 - Kaipara Coast Highway - and Waitoki Rd, after an earlier truck crash.