Floodwaters appear to have washed away the earth beneath the asphalt, leaving the surface of the road floating above a cavity in the ground.

Diversions are in place for light vehicles, but heavy vehicles are not currently suitable for the Illawarra Highway.

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Alternate routes include Sheepwash Rd or Pearsons Lane.

Motorists are advised to delay any unnecessary travel and check www.livetraffic.com for updates prior to travelling.