NZTA posted an image of traffic backed up heading north.
SH2 BELMONT - CRASH - 2:55PM A crash is BLOCKING lanes in both directions at the intersection with Owen Street. Please take extra care and expect delays. ^EW pic.twitter.com/5bAyYXNWcK
The NZ Transport Agency said just before 4pm congestion remained heavy heading north between Drury and Takanini, South Auckland.
"Please continue to expect delays or avoid the area,'' a statement said.
On the other side of town, congestion between Warkworth and Puhoi had eased by 2pm after earlier congestion caused delays late this morning.
Road authorities said earlier that motorists could expect "significant delays'' and, as a result, people were being told to avoid the area, if possible.
Motorists were told to consider using State Highway 16 between Wellsford and Silverdale as an alternative route.
UPDATE 3:40PM Congestion remains heavy heading north between Drury and Takanini. Please continue to expect delays or avoid the area. ^EW https://t.co/vry3Wfj94O
— Waka Kotahi NZTA Auckland & Northland (@WakaKotahiAkNth) January 13, 2019