Traffic was affected for about 12 hours yesterday as the authorities cleaned up a 300m-long oil spill in Tampines Avenue 9.
The Singapore Civil Defence Force was alerted to the spill at 2.40am and dispatched a fire engine to clean the road.
The National Environment Agency and Land Transport Authority were also involved in the clean-up and resurfacing of the affected stretch, which ran towards Tampines Street 44.
One of the road's two lanes was closed off until the work finished at about 2.30pm. It is not known what caused the spill.
There have been at least four major oil spills this year which required resurfacing of the road, causing major traffic snarls.