Singapore legislation
Regulation 131
of Road Traffic (Motor Vehicles, Construction and Use) Rules
Regulation 131
Lamps
Subregulation 1
No person shall use a vehicle during the hours of darkness while it is carrying passengers or cause or permit it to be so used unless every lamp provided in compliance with rule 88 for the internal illumination of the vehicle is at all times during those hours kept lighted to such extent as is necessary to provide adequate illumination of every access from any seat in the vehicle to every exit in the vehicle and of every such marking as is required by rule 81 to be provided in relation to every emergency exit in the vehicle.
Subregulation 2
It shall not be necessary to keep lighted any lamp provided on the upper deck of a double-decked vehicle if a barrier is secured across the bottom of all staircases leading to that deck so as effectively to prevent passengers using any such staircase.