This Seven News report shows the situation many parking rangers face while doing their job.

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United Services Union General Secretary Graeme Kelly said a number of members have suffered “serious harm”.

“We’ve had members with broken legs, broken arms, eye sockets,” he said.

The USU is calling for Councils to implement double patrols similar to police and paramedics.

“We call on the councils to ensure that our members go to work in a safe fashion, in a safe environment and if that means doubling up the shift and putting two together on the job then we insist that that happen and happen immediately.”

Councils across Australia have introduced similar body-worn devices and they have seen a drop in assaults by up to 80 per cent, but they haven’t stopped them, prompting calls for drastic action.