Singapore legislation
Regulation 90
of Civil Aviation Authority of Singapore (Changi Airport) By-laws 2009
Regulation 90
No driving in state of intoxication
No person who is under the influence of drink or of a drug or an intoxicating substance to such an extent as to be incapable of having proper control of a vehicle or equipment shall drive or attempt to drive any vehicle or operate or attempt to operate any equipment in the airside, cargo handling area or passenger terminal building.