The injured were identified as Ms Christeen Rubelliard, daughter of Australian ambassador Paul Rubelliard, and her driver, Mr Adul Artharn and a third victim who was not identified.
The trio was travelling in a Mitsubishi Grandis on their way back to Bangkok from Hua Hin, Thai PBS Reported.
The driver, Mr Adul Artharn told police that as he was approaching Ban Khao Tamone in Ban Lat district of Petchaburi, he somehow lost control of the car and drove the car onto the road island, then crashed into a power pole and overturned.
All the three were taken to Muang districtâ€™s hospital for medical treatment, while the police further investigate Mr. Artharn’s statement.
The Australian Embassy has not released any official statement with regards to the accident.
Elsewhere in Thailand, Two passengers were killed and 20 others injured when a chartered bus from Khon Kaen to Maha Sarakham skidded off a curve on KhonKaen-Yang Takad road in Chiang Yuen district of Maha Sarakham and rammed at a tree on the road shoulder.
The incident happened before dawn Wednesday as the chartered bus was carrying students to have an examination in Maha Sarakham.