Hundreds of cars stuck with flat tyres on busy motorway into Sydney after sharp debris on road

A trucking company has apologised for the debris, which it says spread over a couple of kilometres' on the M1 causing traffic chaos before 5am Friday

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Hundreds of vehicles have been left with flat tyres after sharp metal debris spilled from a truck and spread across a 30km stretch of a busy motorway into Sydney.

Police were called to the southbound M1 between Wyong Road and Mount White on the Central Coast about 5.10am on Friday due to a large amount of metal debris on the roadway", New South Wales police said in a statement.

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