Police car burnt-out in bizarre accident!!!!!!

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Police officers have been left red-faced after a highway patrol car parked on the side of a road in Sydney's west was destroyed by fire.

Officers parked the car on Cowpasture Rd at Horsley Park while they set up for speed checks at 10pm last night.

The car was burnt-out when pine woodchips on the side of the road underneath where it was parked ignited.

A police spokeswoman said highway patrol cars were low-slung and the heat from the engine caused the woodchips to catch fire.

The officers were not injured.

It says "highway patrol cars were low-slung" how low slung ? to catch wood chips alight, was it legally lowered ??? makes me wonder ???