The Singapore Civil Defence Force (SCDF) said it was alerted to a road traffic accident along the ECP towards the Marina Coastal Expressway (MCE) after Bedok South Exit on Jan 9 at about 2am.
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They were speeding and lost control slamming into the railings and flipping over.
Two women, aged 23 and 24, and a 25-year-old man were conscious when taken to Changi General Hospital, said the police.
The accident involved two cars, police investigations are ongoing.