“DUI” stands for “driving under the influence”. It is the shorthand used in South African criminal practice for the offence of driving a motor vehicle on a public road while impaired by alcohol or a drug that has a narcotic effect. The same abbreviation is used in many countries, but the legal meaning is fixed by South African statute and interpreted by South African courts.
In this country a DUI is not a traffic infringement. It is a criminal offence prosecuted in the Magistrate’s Court or the High Court, and a conviction produces a criminal record. Understanding exactly what the law prohibits, what the State must prove, and what the consequences are is the first step for anyone who has been arrested for, or charged with, drunk or drugged driving.
This article sets out the meaning of DUI in South African law, the legal alcohol limits, the statutory offence under the National Road Traffic Act 93 of 1996, police procedure, the penalties a court can impose, and the wider consequences of a conviction. It is written for drivers, their families, and anyone who wants to understand how the offence works in practice.
What Does DUI Mean in South African Law?
The abbreviation DUI refers to two closely related forms of conduct that the law treats as a single category of road offence. The first is driving while one’s ability to do so is impaired by alcohol or drugs. The second is driving with a concentration of alcohol in the blood or breath that exceeds the statutory maximum, whether or not obvious signs of impairment are present. Both fall under the same statutory framework and carry the same range of penalties.
It is a common misconception that a driver is only guilty if they feel “drunk”. South African law does not require the driver to accept that they were impaired. Where a blood or breath sample shows a reading over the prescribed limit, the offence is established on the reading alone. Equally, a driver whose reading is at or below the limit can still be convicted if the State proves, on the other evidence, that they were under the influence of alcohol or a drug to a degree that impaired their ability to drive.
The Statutory Offence: Section 65 of the National Road Traffic Act
The controlling provision is section 65 of the National Road Traffic Act 93 of 1996, which is the principal statute regulating road use in South Africa. Section 65(1) creates two limbs of the offence. The first limb, in section 65(1)(a), prohibits any person from driving a vehicle on a public road while under the influence of intoxicating liquor or a drug having a narcotic effect. The second limb, in section 65(1)(b) read with section 65(2), prohibits driving with a concentration of alcohol in the blood or breath that exceeds the prescribed statutory limit.
Two practical points follow from the drafting. First, the offence applies on a “public road”, which is broadly defined and includes most roads to which the public has access. Second, the prohibition extends to anyone who “occupies the driver’s seat” of a vehicle the engine of which is running, so a person need not actually be moving to be charged. Penalties for the offence are prescribed by section 89 of the same Act read with the schedules that accompany it, and are imposed by a criminal court after conviction.
The Legal Alcohol Limits When Driving in SA
The prescribed limits are set by regulation under the National Road Traffic Act and are expressed for both blood and breath. For ordinary drivers the blood alcohol limit is 0.05 grams of alcohol per 100 millilitres of blood. The equivalent breath limit is 0.24 milligrams of alcohol per 1 000 millilitres of breath. A reading at or above these levels means the second limb of the offence is made out.
- Ordinary drivers. Blood alcohol above 0.05 g per 100 ml, or breath alcohol above 0.24 mg per 1 000 ml.
- Professional drivers. A stricter limit applies to drivers of vehicles used for the conveyance of passengers for hire or reward, and to drivers of heavy goods vehicles. For them the blood limit is 0.02 g per 100 ml and the breath limit is 0.10 mg per 1 000 ml.
South Africa does not yet operate a blanket zero-tolerance regime. A draft regulation proposing a 0.00 g per 100 ml limit for all drivers has been published for comment, but until it is finalised and brought into force the 0.05 g and 0.02 g limits remain the law.
Drugs, Medication and DUI
Section 65 is not limited to alcohol. The phrase “a drug having a narcotic effect” captures illegal narcotics and many prescription and over-the-counter medicines that can impair driving, including strong painkillers, sedatives, and some antihistamines. The test is whether the substance impaired the driver’s ability to control the vehicle, not whether it was lawfully obtained. A lawful prescription is therefore not, on its own, a defence to a charge of driving under the influence of that medication.
Because drug impairment cannot be measured on a single agreed numerical scale in the way alcohol can, drug-related DUI cases tend to rely more heavily on observational evidence, the evidence of the arresting officer, and the results of specialist examinations such as a blood or urine analysis conducted at a laboratory.
How Police Investigate a DUI
A DUI investigation usually begins with a traffic stop, a roadblock, or attendance at the scene of an accident. If an officer forms a reasonable suspicion that a driver is under the influence, the driver may be arrested and taken to a police station or a testing centre. There the officer will typically administer a breath test using an approved evidential breath testing instrument. Where breath testing is not available, or where the reading is to be confirmed, a registered medical practitioner will take a blood sample.
- Observations of impairment. Slurred speech, an unsteady gait, bloodshot eyes, the smell of alcohol, and poor performance on field sobriety tasks.
- Breath testing. An evidential breath test produces a numerical reading that can be used as evidence in court.
- Blood testing. A blood sample is drawn by a medical professional within the statutory time frame and analysed by a forensic laboratory.
The chain of custody of any sample is critical. The State must be able to show that the sample taken from the accused is the same sample analysed in the laboratory and reported on in the certificate produced in court. Breakdowns in that chain, defects in the testing equipment, or failures to follow the prescribed procedure can all be raised in defence.
Penalties and Sentencing for a DUI Conviction
A DUI is punishable under section 89 of the National Road Traffic Act. The sentence is imposed by the court and depends on the circumstances of the offence and the offender. A first conviction may attract a substantial fine, a term of imprisonment that is wholly or partly suspended, or both a fine and imprisonment. Repeat offences, readings that are very high, and cases involving injury or death carry markedly harsher sentences.
- Fine. A monetary penalty, the amount of which the court sets with reference to the seriousness of the offence and the offender’s means.
- Imprisonment. A direct term of imprisonment, or a sentence that is suspended on conditions, may be imposed in addition to or instead of a fine.
- Period of imprisonment increasing with repeat offending. The Act provides for longer maximum terms where the offender has previous convictions for the same offence.
A conviction also engages the licence suspension provisions of the Act. Where a driver is convicted of an offence involving driving under the influence, the court must consider whether the driving licence should be suspended or endorsed, and in serious or repeat cases the licence can be revoked. Drivers who hold professional licences should be aware that the lower 0.02 g limit, together with the regulatory consequences for holders of public driving permits, makes the stakes particularly high.
Consequences Beyond the Courtroom
The consequences of a DUI do not end at the courtroom door. A criminal record for an alcohol-related driving offence can affect employment, particularly where a role requires a clean criminal record or involves driving as part of the job. Professional drivers, holders of public driving permits, and people who work in regulated industries can find that a conviction puts their livelihood at risk.
Insurers treat a DUI conviction as a material change in risk. Premiums can rise sharply, cover can be declined at renewal, and a claim arising out of an accident that occurred while the driver was over the limit may be repudiated. Travel can also be affected, because a number of countries treat an alcohol-related driving conviction as a ground for refusing a visa. These consequences persist long after any fine has been paid and any driving ban has expired, which is one reason why early legal advice is so important.
Defences and How a DUI Case Can Be Challenged
A charge is not the same as a conviction, and a number of recognised defences and challenges are available to a properly represented accused. The most common challenges are directed at the reliability of the State’s evidence rather than at the facts of the driving itself.
- Defective or uncalibrated equipment. An evidential breath testing instrument that was out of calibration, or not operated by a properly trained officer, can produce readings that are inadmissible.
- Breaks in the chain of custody. Where the State cannot prove that the blood sample analysed in the laboratory is the sample drawn from the accused, the certificate of analysis can be excluded.
- Procedural non-compliance. Failure to warn the accused, failure to take the sample within the permitted time, or failure to use a registered medical practitioner can all render evidence inadmissible.
- Contested impairment. In cases resting on observations rather than a reading, the defence can challenge the officer’s conclusions and lead contrary evidence.
The right defence depends on the facts of the docket.
Frequently Asked Questions
What does DUI mean in South Africa?
DUI stands for driving under the influence. In South African law it refers to the offence, created by section 65 of the National Road Traffic Act 93 of 1996, of driving a vehicle on a public road while under the influence of alcohol or a drug having a narcotic effect, or while the alcohol in the blood or breath exceeds the prescribed limit. It is a criminal offence, not a traffic infringement.
What is the legal alcohol limit for drivers in South Africa?
For ordinary drivers the limit is 0.05 grams of alcohol per 100 millilitres of blood, or 0.24 milligrams per 1 000 millilitres of breath. For professional drivers, including drivers of vehicles conveying passengers for hire or reward and drivers of heavy goods vehicles, the limit is stricter at 0.02 grams per 100 millilitres of blood or 0.10 milligrams per 1 000 millilitres of breath.
Is drunk driving a criminal offence in South Africa?
Yes. Driving under the influence of alcohol or drugs is prosecuted as a criminal offence under section 65 of the National Road Traffic Act 93 of 1996, with penalties imposed under section 89 of the same Act. A conviction results in a criminal record and can lead to a fine, imprisonment, and suspension or revocation of the driving licence.
Can you refuse a breathalyzer or blood test in South Africa?
A driver may not lawfully refuse to submit to a breath or blood test when a duly authorised officer requires one. Refusal can itself be treated as an offence and can lead to arrest, and it can be used as evidence against the driver. Blood samples must be taken by a registered medical professional within the time limits set by the Act.
What are the penalties for a first DUI offence?
A first conviction under section 89 of the National Road Traffic Act can result in a fine, imprisonment (which may be suspended in whole or in part), or both, depending on the reading, the circumstances, and the personal circumstances of the offender. The court will also consider whether the driving licence should be suspended or endorsed. Repeat offences carry markedly heavier penalties.
Get help with a criminal law matter. If you have been arrested for or charged with driving under the influence, the Criminal Law department at Otrebski Attorneys can review the docket, assess the strength of the State’s evidence, and represent you from the first appearance through to sentence or acquittal. Our 100% women-led practice, founded by Director Nastasja Otrebski, is rated five stars on Google from 12 reviews and is a Level 4 B-BBEE contributor.
Disclaimer. This article is general information about the meaning of DUI and the law on driving under the influence in South Africa. It is not legal advice, and no attorney-client relationship arises from reading it. The alcohol limits, procedures, and penalties described here are applied by a court to the specific facts of each case, and outcomes vary accordingly. For advice on a particular charge, consult a qualified criminal defence attorney without delay.