Singapore legislation
Regulation 21
of Environmental Protection and Management (Vehicular Emissions) Regulations
Regulation 21
Stationary motor vehicles
Subregulation 1
Subject to paragraph (2), the driver of every motor vehicle shall, when the vehicle is stationary for reasons other than traffic conditions, stop the engine of or other machinery attached to or forming part of the vehicle.
Subregulation 2
Nothing in paragraph (1) shall apply to the examination or working of the machinery attached to or forming part of a motor vehicle where any such examination or working is rendered necessary by any failure or derangement of the machinery or where the machinery is required to be worked for some ancillary purpose.
Subregulation 3
Any person who fails to comply with paragraph (1) shall be guilty of an offence.