SINGAPORE - A car was seen standing upright in a ditch after an accident on the Pan-Island Expressway (PIE) near the Tampines Ave 5 exit.
A man and a woman were seen lying on a road divider in photos posted online.
Singapore Civil Defence Force (SCDF) was alerted at 10.45am, and dispatched one ambulance.
A man in his 60s and a woman in her 50s were sent to Changi General Hospital, SCDF said.
Police investigations are ongoing.
Audio engineer Mohd Sofian Roslan, who was driving behind the grey sedan when it crashed, told The Straits Times that the car suddenly swerved to the right as it was taking the Tampines Ave 5 exit.
The 32-year-old said he stopped his car immediately to help while his wife called for help, and managed to extract both the driver and the passenger out of the car with the help of some foreign workers before the authorities arrived.
"I saw that the driver's left wrist was broken, he had bruises on his knuckles and shin and was complaining of a pain in his abdomen," said Mr Sofian. "His wife (the woman) looked fine except for some slight bruises on her hand and neck."
Photos of the accident were captured by Mr Johnson Chong, who put them up on Facebook on Tuesday morning.