A campervan has rolled on State Highway 1 south of Auckland.

The NZ Transport Agency said the crash at 12.05pm was blocking the right-hand lane southbound, near the Nikau Rd off-ramp, on Bombay Hill.

The campervan occupants were unhurt and had exited safely, police said.

Both lanes of the motorway were briefly closed to shift the campervan.

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The road was cleared by 12.50pm.

Both lanes south on SH1 have been temporarily closed to enable vehicle recovery. Emergency services are hopeful of reopening a lane shortly. Please be patient.