Victoria’s acting assistant commissioner of road policing says he’s “astounded” by how many motorists aren’t wearing seat belts.

It comes amid a spike in road deaths.

Twelve road deaths so far this year have been directly linked to not wearing a seat belt, but acting assistant commissioner of road policing, Martin O’Brien, says he “would expect that to rise”.

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“International research says you’re at 50 per cent greater chance of survival so I’m absolutely amazed that people aren’t just putting that belt on,” Mr O’Brien told Ross and Russel.