A blue sedan collided with a silver Toyota and a bus on Tampines Avenue 7 at around 1am yesterday.
The impact of the crash sent the blue sedan into a 180-degree turn across the dividers and onto the opposite side of the two-lane dual carriageway.
The sedan moved for another 300m before hitting a kerb and stopping. Eyewitnesses said the driver fled the scene.
Passers-by later helped to free the male driver and female driver in the Toyota. The woman was taken to hospital, where she was treated for abrasions.