Alcohol Interlock Program NSW

What is the Alcohol Interlock Program?

The NSW Mandatory Alcohol Interlock Program, established under section 211 of the Road Transport Act 2013 (NSW), requires certain drink driving offenders to have an alcohol interlock device installed in any vehicle they drive for a set period after their disqualification ends. The device is wired to the ignition and prevents the vehicle from starting unless the driver provides a breath sample below a preset, near-zero alcohol limit.

If you have been ordered onto the program, or expect to be as part of a drink driving matter, our Sydney traffic lawyers can explain exactly how it will apply to you and help you plan around the disqualification and interlock periods, including the practical and financial steps you should start taking well before your disqualification ends.

Who Must Participate

The interlock program is mandatory — not optional — for the following categories of offender, regardless of whether you feel you have already learned your lesson from the disqualification alone:

• Mid range PCA (first offence): Mandatory 12-month interlock period.
• High range PCA (first offence): Mandatory 24-month interlock period.
• Second or subsequent PCA offence (any range): Mandatory 24 to 48-month interlock period.
• Refusing a breath analysis: Mandatory 24-month interlock period.

A Magistrate can, in limited circumstances, grant an exemption from the program — for example, where you have no ongoing access to a vehicle, or a genuine medical condition prevents you from providing a valid sample. An exemption generally results in a longer straight disqualification period being imposed instead.

This program is directly connected to your drink driving charge. For the full penalty tables and defences for the underlying PCA offence, see our Drink Driving Lawyers Sydney page, or our DUI Lawyers Sydney page if you're not yet sure which charge applies to you.

Approved Interlock Providers

You cannot simply install any breathalyser-style device. The interlock must be installed and maintained by one of the small number of providers accredited by Transport for NSW. Accredited providers typically offer:

• Installation at approved service centres across the Sydney metropolitan area and regional NSW;
• Ongoing calibration and data download appointments roughly every 28 days, as required by your interlock order; and
• Customer support for troubleshooting device faults or false readings.

We can point you toward the current list of accredited providers and help you understand what to expect from the installation and monitoring process, including your ongoing obligations to attend calibration appointments on time.

How the Program Works, Costs and Duration

Around 8 weeks before your licence disqualification period is due to end, you must contact Transport for NSW to begin the application process. This involves a medical assessment with an approved doctor, selecting an accredited interlock provider, and arranging professional installation of the device at an approved service centre.

Participants are responsible for the costs of the program, which typically include:

• A medical assessment fee;
• Device installation at an approved service centre;
• Ongoing monthly lease and monitoring costs, plus a calibration and data download appointment roughly every 28 days; and
• An administration fee payable to Transport for NSW.

Total costs commonly run to several thousand dollars over the full interlock period. A 35% concession is available for eligible pensioner concession card, low income health care card, and Department of Veterans' Affairs gold card holders, and a Severe Financial Hardship program can assist participants who genuinely cannot afford the costs — contact Service NSW to check your eligibility.

Once installed, the device records every breath test and driving attempt. This data is downloaded and reviewed regularly by Transport for NSW, and a pattern of failed or missed tests can result in your interlock period being extended.

Consequences of Breaching an Interlock Order

The program is closely monitored, and non-compliance carries serious consequences. These can include:

• Driving without an installed interlock while subject to an interlock order — a distinct criminal offence in its own right, on top of the underlying drink driving matter;
• Tampering with or bypassing the device, which is treated extremely seriously by Transport for NSW and the Courts;
• Repeated failed breath tests or missed calibration appointments, which can trigger a review and potential extension of your interlock period; and
• Failing to remove the device or return it to the provider at the end of the period as required.

If you have received a notice regarding a suspected breach of your interlock order, it is important to get advice quickly, as these matters can affect both your current program and any future traffic matters.

How It Interacts With Your Disqualification Period

The interlock program does not replace your licence disqualification — it applies as a separate, second stage that begins only after your disqualification period ends. The Court sets both a disqualification period and a mandatory interlock period at sentencing:

In practical terms, this means you serve the disqualification period first with no driving at all, and only once that period ends and you have completed the application process can you drive again — exclusively in a vehicle fitted with a working interlock device — for the remainder of the interlock period. Planning ahead for this transition, including arranging your medical assessment and provider booking before your disqualification ends, helps you get back on the road with as little delay as possible.

How We Can Help

At NS Criminal Lawyers and Associates, we help clients understand exactly how the alcohol interlock program will affect them, advise on whether an exemption is realistically available, and represent clients at sentencing to secure the shortest possible combined disqualification and interlock outcome.

We also assist clients who are already on the program and facing a compliance issue, such as a disputed positive reading or a missed calibration appointment, to respond quickly and protect their ongoing participation. Getting advice early in either scenario gives you the best chance of a smooth path back to full driving rights.