The incident, in which the woman suffered a cut to her arm, happened at about 11pm on Thursday, February 7.
She flagged down the vehicle and the driver took her to the police station in Leamington.
Det Sgt Andy Mackay would like to hear from the driver, or anyone else who witnessed the incident, and can be contacted on 415000.
Alternatively call Crimestoppers anonymously on 0800 555 111.