NSW Police alleged a man behind the wheel of a BMW became involved in a confrontation with another man driving a Holden Barina at the intersection of Caroline Chisholm Drive and Hilary Street in Winston Hills.

Officers were told the Barina driver, aged in his 40s, allegedly got out of his car and assaulted the BMW driver, aged in his 20s.

The injured man suffered a dislocated shoulder and cut to his face.

Officers from Parramatta Local Area Command attended the scene and spoke to both drivers.

Police have not made an arrest but are continuing their inquiries.

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