Initial findings suggest the vehicle's handbrake may not have been engaged.
Authorities hope Singapore will reach its climate goals of reducing emissions by 2030 and achieving net-zero emissions by 2050.
The motorcyclist was conveyed conscious to Changi General Hospital, and is assisting with investigations.
Rescuers continue their attempt to locate the remaining two missing people.
The driver admitted to dumping the trash on the road out of convenience.
In an attempt to flee from authorities, the driver reached 174 km/h on the East Coast Parkway.
The three male suspects were aged between 17 and 21.
Eligible CHAS customers may present their physical or digital cards during payment to receive the discount.
During the arrest, the police seized ten company staff passes and several company documents believed to be forged.
The fight stemmed from the RM7 (S$2.25) fare.