The victim's parents have been remanded for seven days to help with the investigations.
One of them, aged 17, pleaded guilty and was sentenced to 15 months' probation.
Preliminary investigations found no signs of foul play.
Gavin Lee, who previously led the Tampines Rovers Football Club, has been appointed interim head coach.
One netizen joked it was a Corrective Work Order punishment session for petty criminals.
The case has been referred to AVS after the site manager refused to cooperate with investigations.
The OP claimed the man was "intoxicated on most days", as they often heard shouting from his flat.
As the driver was unharmed, he did not need to be taken to the hospital.
It is believed that a stove was the source of ignition.
Cycling on expressways carries a fine not exceeding $2,000, or an imprisonment term of up to six months.