A crash involving a concrete truck on Auckland’s Southern Motorway has caused traffic mayhem today, with northbound commuters backed up about 13km.

NZ Transport Agency Waka Kotahi said a crash blocked three northbound lanes between the Khyber Pass Rd off-ramp and Symonds St off-ramp, with only one lane functional about noon.

Shortly after 1pm, Google Maps showed northbound traffic gridlocked from Newmarket back to Tip Top corner – with the 10km stretch of State Highway 1 taking about 26 minutes to pass through.

In an update at 1pm, NZTA said the left northbound lane remained blocked.

A concrete truck crash on Auckland’s Southern Motorway has caused major delays this afternoon, with queues stretching about 13km.

“Pass with care and expect delays until recovery and clean-up operations are complete.”

Police and Fire and Emergency NZ also attended.

At 1.30pm, police said the crash had been cleared and all lanes had reopened. No injuries were reported.

At 3.20pm, Google Maps showed northbound traffic had backed up 13km from Newmarket to Ōtāhuhu. Photo / Google Maps

At 3.20pm, Google Maps showed northbound traffic had backed up 13km from Newmarket to Ōtāhuhu.

The NZTA Journey Planner said from Manukau to Albany via SH1 would take commuters about an hour – more than 30 minutes longer than if it were free-flowing.