"The incident involved a male motorist having an altercation with another motorist while stationary at the traffic lights," Warrnambool police Constable Nathan Hunt said.

"It's alleged a male got out of his vehicle, approached a woman's car and smashed the passenger's side window and mirror, before leaving the scene.

"It was a frightening road rage incident in the middle of a very busy intersection early on a Saturday afternoon.

"The woman was left badly shaken and the incident was reported to police.

"Anyone with information, or dash camera footage, is requested to contact me at the Warrnambool police station on 5560 1333 or Crime Stoppers anonymously on 1800 333 000.

"This was a disturbing incident and any assistance to identify the man involved would be greatly appreciated."

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