SH1 was later reopened around 5.15pm, with one lane remaining blocked at the Kyber Pass Rd off-ramp.
The Gillies Ave on-ramp will remain closed until all lanes are clear; with traffic built up following the crash.
“Police thank motorists for their patience while the road was closed.”
Hato Hone St John said they were notified of the accident at 3.08pm and responded by sending two ambulances, two rapid response units, and two managers to the scene.
“Our crews assessed and treated one patient in a critical condition who was transported to Auckland City Hospital.”
A police spokesperson said they were alerted to the crash on the motorway between Market Rd and Gillies Ave, near the Newmarket off-ramp, at 3.10pm.
“The northbound lanes are blocked,” police said initially.
“Motorists are asked to take alternative routes where possible.”
