A crash is causing major delays on State Highway 2 in Wellington this afternoon.

The crash is blocking the left lane, north-bound, on SH2 near Horokiwi.

It is not yet known whether anyone has been injured.

The NZ Transport Agency said just before 5pm the delays were significant.

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Video footage shows long lines of vehicles moving slowly.

Motorists are being urged to find alternative routes or to expect delays.

"Allow extra time,'' authorities said.