The crash caused a three-hour jam and tailbacks up to 8km long on the highway, with much of the traffic coming to a standstill.
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SCDF told AsiaOne that they received a call at about 2.30pm on Saturday about the collision.
Three ambulances were sent to the scene. SCDF said there were 5 casualties involed in the accident.
Two females, both aged 50, and two males, aged 36 and 61, were sent to Changi General Hospital, while the two-year-old girl was sent to KK Women's and Children's Hospital.