A large mudslide has blocked both lanes of State Highway 73 near Arthur’s Pass, causing significant delays for motorists.

The slip was reported at 4.08pm on Sunday, with contractors working to clear the blockage.

In an update, NZTA said a large mudslide was blocking both lanes and road users should expect significant delays while crews worked to reopen the road.

NZTA said motorists should delay their journey or avoid the area if possible, as there was no detour available.

An area warning is also in place on the West Coast side of SH73 between the West Coast (Kumara Junction) and Arthurs Pass, urging road users to drive with caution due to surface flooding and strong winds.

Strong winds and heavy rain have been problematic for much of the South Island today, bringing down trees on state highways in addition to the flooding.