NZTA advise that a crash at around 4:00am this morning remains blocking the two left lanes northbound on SH1, south of the Paremata Roundabout.
One person has been transported to Wellington Hospital in a critical condition following the one car crash.
Police are advising drivers to avoid travelling north on SH1.
The road is expected to be cleared by 8:00am.
Police ask drivers to be patient should they experience delays.