Driver shaken after rock thrown from bridge onto car windscreen

Police are searching for the person who threw a huge rock off a bridge and onto a car windscreen near Geelong in Victoria.

The rock smashed through the windscreen as the car was travelling under a rail bridge on the Surf Coast Highway in Grovedale yesterday.

The driver, Kristy Browning, said "if it was up just that little bit higher, it probably would have gone straight through".

Browning and her wife had been driving home from the cinema late at night.

Her wife was sitting in the passenger seat and said she felt glass falling on her.

"From other stories that you've probably heard, people die from this stuff," Browning said.

The bridge does not have any pedestrian access.

"Officers were called to reports a car had been struck by an object causing its window to crack about 11.30pm," Victoria Police said in a statement.

9News understands that similar incidents had been reported to police at that location in recent weeks.

Anyone with dashcam footage or information can contact Crime Stoppers on 1800 333 000.