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A concrete truck lost its load on the North-Western motorway in Auckland this morning.
Inspector Turepu Keenan said wet concrete and metal covered all three lanes just before the Rosebank exit.
Mr Keenan said motorists could expect "significant delays" as emergency services worked to clear the blockage.
The Automobile Association (AA) said traffic was heavy and advised motorists to delay travel or use an alternative route.
- NZPA
