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Alcohol, Drugs and Driving

Alcohol and drugs can have a significant effect on a person's ability to drive.

Effects of alcohol

The effect of alcohol varies greatly from person to person. It can depend on a variety of factors, such as:

  • the length of time since the person has eaten
  • how much they weigh
  • sex
  • level of fitness
  • the health of their liver
  • whether they regularly drink
  • mood
  • the type of drink consumed
  • the person's efficiency in eliminating alcohol from the body (which may vary from time to time as well as from person to person).

See the Drug and Alcohol Services South Australia fact sheet on Blood alcohol concentration.

Drink driving offences

All references in this part are to the Road Traffic Act 1961 (SA) unless otherwise stated. The Act creates 4 major offences:

  • DUI (driving under the influence of alcohol or drugs) [s 47]
  • PCA (driving with a prescribed concentration of alcohol) [s 47B]
  • Driving with Prescribed Drug in Oral Fluid or Blood [s 47BA]
  • Refusing to blow (refusing to comply with directions in relation to a breath test) [s 47E].

The elements of each of these offences is discussed in the following sections.

Specific offences apply where a person is caught drink or drug driving while a child aged under 16 years is present in the vehicle at the time of the offence.

See also our Drink Driving and the Law Factsheet and Drug Driving and the Law Factsheet.

Meaning of vehicle and motor vehicle

The drug and alcohol offences under the Road Traffic Act 1961 (SA) apply either when a person drives, or attempts to move, a vehicle [s 47] or a motor vehicle [ss 47B or 47BA].

The definition of vehicle includes motor vehicles, trailers, trams, bicycles, electric scooters and other personal mobility devices, animal-drawn vehicles and animals being ridden or drawing vehicles, and motorised wheelchairs that can travel at more than 10km/h [s 5].

The definition of motor vehicle is 'a vehicle built to be propelled by a motor that forms part of the vehicle' [s 5]. This is a broad definition and certain vehicles and devices are excluded by regulation.

Alcohol, Drugs and Driving  :  Last Revised: Tue Jul 8th 2025
The content of the Law Handbook is made available as a public service for information purposes only and should not be relied upon as a substitute for legal advice. See Disclaimer for details. For free and confidential legal advice in South Australia call 1300 366 424.