Phil and Sue Ronaldson were driving near Frankston over the weekend when their car was suddenly hit by a large rock.
Their car was travelling at 100km/h at the time, with dashcam video capturing the moment of impact.
“All of a sudden there was a big smash and the windscreen broke and shattered,” Phil said.
“You’re expecting a nice easy cruise up the freeway and you don’t expect to get a rock in your face.”
After pulling over on the side of the freeway, the couple noticed dozens of smaller rocks littered along the road.
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They are calling on those responsible to be aware of how close they came to potentially killing someone.
“Anything could have happened,” Phil said.
“We could have had a multi-car pile-up easily, there was a lot of traffic coming back from the peninsula.”
The dashcam footage has been handed to police, who are investigating.